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Finding the Fourth Proportional to 86,008.68, 128,876.94 and 66,335.40

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Solution

The fourth proportional to 86,008.68, 128,876.94 and 66,335.40 is: 99,398.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,008.68 : 128,876.94 = 66,335.40 : x
  2. Step 2: Convert to fraction form
    86,008.68/128,876.94 = 66,335.40/x
  3. Step 3: Cross multiply
    86,008.68x = 128,876.94 × 66,335.40
  4. Step 4: Simplify right side
    86,008.68x = 8,549,103,365.68
  5. Step 5: Solve for x
    x = 8,549,103,365.68/86,008.68
  6. Step 6: Final answer
    x = 99,398.15

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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.