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Finding the Fourth Proportional to 128,991.66, 178,000.55 and 71,627.50

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Solution

The fourth proportional to 128,991.66, 178,000.55 and 71,627.50 is: 98,841.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,991.66 : 178,000.55 = 71,627.50 : x
  2. Step 2: Convert to fraction form
    128,991.66/178,000.55 = 71,627.50/x
  3. Step 3: Cross multiply
    128,991.66x = 178,000.55 × 71,627.50
  4. Step 4: Simplify right side
    128,991.66x = 12,749,733,505.12
  5. Step 5: Solve for x
    x = 12,749,733,505.12/128,991.66
  6. Step 6: Final answer
    x = 98,841.53

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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.