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Finding the Fourth Proportional to 487,000.40, 730,500.60 and 398,426.90

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Solution

The fourth proportional to 487,000.40, 730,500.60 and 398,426.90 is: 597,640.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,000.40 : 730,500.60 = 398,426.90 : x
  2. Step 2: Convert to fraction form
    487,000.40/730,500.60 = 398,426.90/x
  3. Step 3: Cross multiply
    487,000.40x = 730,500.60 × 398,426.90
  4. Step 4: Simplify right side
    487,000.40x = 291,051,089,506.14
  5. Step 5: Solve for x
    x = 291,051,089,506.14/487,000.40
  6. Step 6: Final answer
    x = 597,640.35

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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.