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Finding the Fourth Proportional to 171,672.60, 257,585.70 and 78,130.20

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Solution

The fourth proportional to 171,672.60, 257,585.70 and 78,130.20 is: 117,230.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,672.60 : 257,585.70 = 78,130.20 : x
  2. Step 2: Convert to fraction form
    171,672.60/257,585.70 = 78,130.20/x
  3. Step 3: Cross multiply
    171,672.60x = 257,585.70 × 78,130.20
  4. Step 4: Simplify right side
    171,672.60x = 20,125,222,258.14
  5. Step 5: Solve for x
    x = 20,125,222,258.14/171,672.60
  6. Step 6: Final answer
    x = 117,230.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.