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Finding the Fourth Proportional to 129,386.84, 178,553.90 and 72,798.22

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Solution

The fourth proportional to 129,386.84, 178,553.90 and 72,798.22 is: 100,461.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,386.84 : 178,553.90 = 72,798.22 : x
  2. Step 2: Convert to fraction form
    129,386.84/178,553.90 = 72,798.22/x
  3. Step 3: Cross multiply
    129,386.84x = 178,553.90 × 72,798.22
  4. Step 4: Simplify right side
    129,386.84x = 12,998,406,094.06
  5. Step 5: Solve for x
    x = 12,998,406,094.06/129,386.84
  6. Step 6: Final answer
    x = 100,461.58

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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.