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Finding the Fourth Proportional to 129,978.60, 194,967.90 and 85,655.40

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Solution

The fourth proportional to 129,978.60, 194,967.90 and 85,655.40 is: 128,483.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,978.60 : 194,967.90 = 85,655.40 : x
  2. Step 2: Convert to fraction form
    129,978.60/194,967.90 = 85,655.40/x
  3. Step 3: Cross multiply
    129,978.60x = 194,967.90 × 85,655.40
  4. Step 4: Simplify right side
    129,978.60x = 16,700,053,461.66
  5. Step 5: Solve for x
    x = 16,700,053,461.66/129,978.60
  6. Step 6: Final answer
    x = 128,483.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.