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Finding the Fourth Proportional to 1,200.73, 1,801.10 and 420.73

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Solution

The fourth proportional to 1,200.73, 1,801.10 and 420.73 is: 631.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.73 : 1,801.10 = 420.73 : x
  2. Step 2: Convert to fraction form
    1,200.73/1,801.10 = 420.73/x
  3. Step 3: Cross multiply
    1,200.73x = 1,801.10 × 420.73
  4. Step 4: Simplify right side
    1,200.73x = 757,776.80
  5. Step 5: Solve for x
    x = 757,776.80/1,200.73
  6. Step 6: Final answer
    x = 631.10

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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.