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Finding the Fourth Proportional to 128,025.90, 176,672.04 and 71,436.06

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Solution

The fourth proportional to 128,025.90, 176,672.04 and 71,436.06 is: 98,579.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,025.90 : 176,672.04 = 71,436.06 : x
  2. Step 2: Convert to fraction form
    128,025.90/176,672.04 = 71,436.06/x
  3. Step 3: Cross multiply
    128,025.90x = 176,672.04 × 71,436.06
  4. Step 4: Simplify right side
    128,025.90x = 12,620,754,449.76
  5. Step 5: Solve for x
    x = 12,620,754,449.76/128,025.90
  6. Step 6: Final answer
    x = 98,579.70

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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.