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Finding the Fourth Proportional to 664,693.20, 997,039.80 and 399,272.40

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Solution

The fourth proportional to 664,693.20, 997,039.80 and 399,272.40 is: 598,908.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,693.20 : 997,039.80 = 399,272.40 : x
  2. Step 2: Convert to fraction form
    664,693.20/997,039.80 = 399,272.40/x
  3. Step 3: Cross multiply
    664,693.20x = 997,039.80 × 399,272.40
  4. Step 4: Simplify right side
    664,693.20x = 398,090,473,841.52
  5. Step 5: Solve for x
    x = 398,090,473,841.52/664,693.20
  6. Step 6: Final answer
    x = 598,908.60

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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.