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Finding the Fourth Proportional to 1,210.50, 1,815.99 and 388.79

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Solution

The fourth proportional to 1,210.50, 1,815.99 and 388.79 is: 583.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.50 : 1,815.99 = 388.79 : x
  2. Step 2: Convert to fraction form
    1,210.50/1,815.99 = 388.79/x
  3. Step 3: Cross multiply
    1,210.50x = 1,815.99 × 388.79
  4. Step 4: Simplify right side
    1,210.50x = 706,027.73
  5. Step 5: Solve for x
    x = 706,027.73/1,210.50
  6. Step 6: Final answer
    x = 583.25

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.