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Finding the Fourth Proportional to 128,750.42, 177,677.70 and 71,392.16

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Solution

The fourth proportional to 128,750.42, 177,677.70 and 71,392.16 is: 98,522.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,750.42 : 177,677.70 = 71,392.16 : x
  2. Step 2: Convert to fraction form
    128,750.42/177,677.70 = 71,392.16/x
  3. Step 3: Cross multiply
    128,750.42x = 177,677.70 × 71,392.16
  4. Step 4: Simplify right side
    128,750.42x = 12,684,793,898.44
  5. Step 5: Solve for x
    x = 12,684,793,898.44/128,750.42
  6. Step 6: Final answer
    x = 98,522.35

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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.