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Finding the Fourth Proportional to 129,573.59, 178,814.51 and 72,218.81

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Solution

The fourth proportional to 129,573.59, 178,814.51 and 72,218.81 is: 99,663.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,573.59 : 178,814.51 = 72,218.81 : x
  2. Step 2: Convert to fraction form
    129,573.59/178,814.51 = 72,218.81/x
  3. Step 3: Cross multiply
    129,573.59x = 178,814.51 × 72,218.81
  4. Step 4: Simplify right side
    129,573.59x = 12,913,769,867.77
  5. Step 5: Solve for x
    x = 12,913,769,867.77/129,573.59
  6. Step 6: Final answer
    x = 99,663.60

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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.