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Finding the Fourth Proportional to 86,446.28, 129,447.12 and 69,499.64

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Solution

The fourth proportional to 86,446.28, 129,447.12 and 69,499.64 is: 104,070.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,446.28 : 129,447.12 = 69,499.64 : x
  2. Step 2: Convert to fraction form
    86,446.28/129,447.12 = 69,499.64/x
  3. Step 3: Cross multiply
    86,446.28x = 129,447.12 × 69,499.64
  4. Step 4: Simplify right side
    86,446.28x = 8,996,528,239.04
  5. Step 5: Solve for x
    x = 8,996,528,239.04/86,446.28
  6. Step 6: Final answer
    x = 104,070.74

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1.5x scale

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.