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Finding the Fourth Proportional to 128,617.68, 177,492.40 and 71,260.72

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Solution

The fourth proportional to 128,617.68, 177,492.40 and 71,260.72 is: 98,339.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,617.68 : 177,492.40 = 71,260.72 : x
  2. Step 2: Convert to fraction form
    128,617.68/177,492.40 = 71,260.72/x
  3. Step 3: Cross multiply
    128,617.68x = 177,492.40 × 71,260.72
  4. Step 4: Simplify right side
    128,617.68x = 12,648,236,218.53
  5. Step 5: Solve for x
    x = 12,648,236,218.53/128,617.68
  6. Step 6: Final answer
    x = 98,339.79

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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.