Home / 122,787.60-169,345.80-72,438

Finding the Fourth Proportional to 122,787.60, 169,345.80 and 72,438

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Solution

The fourth proportional to 122,787.60, 169,345.80 and 72,438 is: 99,904.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,787.60 : 169,345.80 = 72,438 : x
  2. Step 2: Convert to fraction form
    122,787.60/169,345.80 = 72,438/x
  3. Step 3: Cross multiply
    122,787.60x = 169,345.80 × 72,438
  4. Step 4: Simplify right side
    122,787.60x = 12,267,071,060.40
  5. Step 5: Solve for x
    x = 12,267,071,060.40/122,787.60
  6. Step 6: Final answer
    x = 99,904.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.