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Finding the Fourth Proportional to 157,438.76, 217,267.75 and 85,818.78

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Solution

The fourth proportional to 157,438.76, 217,267.75 and 85,818.78 is: 118,431.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,438.76 : 217,267.75 = 85,818.78 : x
  2. Step 2: Convert to fraction form
    157,438.76/217,267.75 = 85,818.78/x
  3. Step 3: Cross multiply
    157,438.76x = 217,267.75 × 85,818.78
  4. Step 4: Simplify right side
    157,438.76x = 18,645,653,238.35
  5. Step 5: Solve for x
    x = 18,645,653,238.35/157,438.76
  6. Step 6: Final answer
    x = 118,431.15

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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.