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Finding the Fourth Proportional to 487,123.80, 730,685.70 and 399,643.80

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Solution

The fourth proportional to 487,123.80, 730,685.70 and 399,643.80 is: 599,465.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,123.80 : 730,685.70 = 399,643.80 : x
  2. Step 2: Convert to fraction form
    487,123.80/730,685.70 = 399,643.80/x
  3. Step 3: Cross multiply
    487,123.80x = 730,685.70 × 399,643.80
  4. Step 4: Simplify right side
    487,123.80x = 292,014,009,753.66
  5. Step 5: Solve for x
    x = 292,014,009,753.66/487,123.80
  6. Step 6: Final answer
    x = 599,465.70

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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.