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Finding the Fourth Proportional to 100,366.79, 138,158.48 and 86,748.58

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Solution

The fourth proportional to 100,366.79, 138,158.48 and 86,748.58 is: 119,412.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,366.79 : 138,158.48 = 86,748.58 : x
  2. Step 2: Convert to fraction form
    100,366.79/138,158.48 = 86,748.58/x
  3. Step 3: Cross multiply
    100,366.79x = 138,158.48 × 86,748.58
  4. Step 4: Simplify right side
    100,366.79x = 11,985,050,830.42
  5. Step 5: Solve for x
    x = 11,985,050,830.42/100,366.79
  6. Step 6: Final answer
    x = 119,412.52

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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.