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Finding the Fourth Proportional to 123,436.80, 170,366.40 and 72,460.80

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Solution

The fourth proportional to 123,436.80, 170,366.40 and 72,460.80 is: 100,009.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,436.80 : 170,366.40 = 72,460.80 : x
  2. Step 2: Convert to fraction form
    123,436.80/170,366.40 = 72,460.80/x
  3. Step 3: Cross multiply
    123,436.80x = 170,366.40 × 72,460.80
  4. Step 4: Simplify right side
    123,436.80x = 12,344,885,637.12
  5. Step 5: Solve for x
    x = 12,344,885,637.12/123,436.80
  6. Step 6: Final answer
    x = 100,009.77

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1.5x scale

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.