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Finding the Fourth Proportional to 129,655.25, 178,924.25 and 70,039.25

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Solution

The fourth proportional to 129,655.25, 178,924.25 and 70,039.25 is: 96,654.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,655.25 : 178,924.25 = 70,039.25 : x
  2. Step 2: Convert to fraction form
    129,655.25/178,924.25 = 70,039.25/x
  3. Step 3: Cross multiply
    129,655.25x = 178,924.25 × 70,039.25
  4. Step 4: Simplify right side
    129,655.25x = 12,531,720,276.81
  5. Step 5: Solve for x
    x = 12,531,720,276.81/129,655.25
  6. Step 6: Final answer
    x = 96,654.17

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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.