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Finding the Fourth Proportional to 84,248.76, 126,369.12 and 21,069.28

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Solution

The fourth proportional to 84,248.76, 126,369.12 and 21,069.28 is: 31,602.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,248.76 : 126,369.12 = 21,069.28 : x
  2. Step 2: Convert to fraction form
    84,248.76/126,369.12 = 21,069.28/x
  3. Step 3: Cross multiply
    84,248.76x = 126,369.12 × 21,069.28
  4. Step 4: Simplify right side
    84,248.76x = 2,662,506,372.63
  5. Step 5: Solve for x
    x = 2,662,506,372.63/84,248.76
  6. Step 6: Final answer
    x = 31,602.91

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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.