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Finding the Fourth Proportional to 129,644.34, 178,908.13 and 72,282.98

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Solution

The fourth proportional to 129,644.34, 178,908.13 and 72,282.98 is: 99,749.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,644.34 : 178,908.13 = 72,282.98 : x
  2. Step 2: Convert to fraction form
    129,644.34/178,908.13 = 72,282.98/x
  3. Step 3: Cross multiply
    129,644.34x = 178,908.13 × 72,282.98
  4. Step 4: Simplify right side
    129,644.34x = 12,932,012,782.63
  5. Step 5: Solve for x
    x = 12,932,012,782.63/129,644.34
  6. Step 6: Final answer
    x = 99,749.92

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1.5x scale

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.