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Finding the Fourth Proportional to 1,210.11, 1,815.06 and 388.35

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Solution

The fourth proportional to 1,210.11, 1,815.06 and 388.35 is: 582.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,210.11 : 1,815.06 = 388.35 : x
  2. Step 2: Convert to fraction form
    1,210.11/1,815.06 = 388.35/x
  3. Step 3: Cross multiply
    1,210.11x = 1,815.06 × 388.35
  4. Step 4: Simplify right side
    1,210.11x = 704,878.55
  5. Step 5: Solve for x
    x = 704,878.55/1,210.11
  6. Step 6: Final answer
    x = 582.49

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.