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Finding the Fourth Proportional to 425,712.80, 638,569.20 and 399,468.80

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Solution

The fourth proportional to 425,712.80, 638,569.20 and 399,468.80 is: 599,203.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,712.80 : 638,569.20 = 399,468.80 : x
  2. Step 2: Convert to fraction form
    425,712.80/638,569.20 = 399,468.80/x
  3. Step 3: Cross multiply
    425,712.80x = 638,569.20 × 399,468.80
  4. Step 4: Simplify right side
    425,712.80x = 255,088,472,040.96
  5. Step 5: Solve for x
    x = 255,088,472,040.96/425,712.80
  6. Step 6: Final answer
    x = 599,203.20

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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.