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Finding the Fourth Proportional to 129,575.52, 178,810.56 and 72,985.60

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Solution

The fourth proportional to 129,575.52, 178,810.56 and 72,985.60 is: 100,718.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,575.52 : 178,810.56 = 72,985.60 : x
  2. Step 2: Convert to fraction form
    129,575.52/178,810.56 = 72,985.60/x
  3. Step 3: Cross multiply
    129,575.52x = 178,810.56 × 72,985.60
  4. Step 4: Simplify right side
    129,575.52x = 13,050,596,007.94
  5. Step 5: Solve for x
    x = 13,050,596,007.94/129,575.52
  6. Step 6: Final answer
    x = 100,718.07

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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.