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Finding the Fourth Proportional to 123,486.32, 170,411.65 and 66,897.70

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Solution

The fourth proportional to 123,486.32, 170,411.65 and 66,897.70 is: 92,319.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,486.32 : 170,411.65 = 66,897.70 : x
  2. Step 2: Convert to fraction form
    123,486.32/170,411.65 = 66,897.70/x
  3. Step 3: Cross multiply
    123,486.32x = 170,411.65 × 66,897.70
  4. Step 4: Simplify right side
    123,486.32x = 11,400,146,844.93
  5. Step 5: Solve for x
    x = 11,400,146,844.93/123,486.32
  6. Step 6: Final answer
    x = 92,319.11

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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.