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Finding the Fourth Proportional to 128,929.40, 193,442.70 and 62,428.40

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Solution

The fourth proportional to 128,929.40, 193,442.70 and 62,428.40 is: 93,666.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,929.40 : 193,442.70 = 62,428.40 : x
  2. Step 2: Convert to fraction form
    128,929.40/193,442.70 = 62,428.40/x
  3. Step 3: Cross multiply
    128,929.40x = 193,442.70 × 62,428.40
  4. Step 4: Simplify right side
    128,929.40x = 12,076,318,252.68
  5. Step 5: Solve for x
    x = 12,076,318,252.68/128,929.40
  6. Step 6: Final answer
    x = 93,666.13

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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.