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Finding the Fourth Proportional to 423,818.19, 635,487.66 and 139,431.78

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Solution

The fourth proportional to 423,818.19, 635,487.66 and 139,431.78 is: 209,068.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,818.19 : 635,487.66 = 139,431.78 : x
  2. Step 2: Convert to fraction form
    423,818.19/635,487.66 = 139,431.78/x
  3. Step 3: Cross multiply
    423,818.19x = 635,487.66 × 139,431.78
  4. Step 4: Simplify right side
    423,818.19x = 88,607,175,601.83
  5. Step 5: Solve for x
    x = 88,607,175,601.83/423,818.19
  6. Step 6: Final answer
    x = 209,068.84

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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.