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Finding the Fourth Proportional to 84,381.76, 126,089.21 and 64,279.72

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Solution

The fourth proportional to 84,381.76, 126,089.21 and 64,279.72 is: 96,051.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,381.76 : 126,089.21 = 64,279.72 : x
  2. Step 2: Convert to fraction form
    84,381.76/126,089.21 = 64,279.72/x
  3. Step 3: Cross multiply
    84,381.76x = 126,089.21 × 64,279.72
  4. Step 4: Simplify right side
    84,381.76x = 8,104,979,113.82
  5. Step 5: Solve for x
    x = 8,104,979,113.82/84,381.76
  6. Step 6: Final answer
    x = 96,051.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.