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Finding the Fourth Proportional to 157,638.71, 217,484.56 and 121,351.25

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Solution

The fourth proportional to 157,638.71, 217,484.56 and 121,351.25 is: 167,420.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,638.71 : 217,484.56 = 121,351.25 : x
  2. Step 2: Convert to fraction form
    157,638.71/217,484.56 = 121,351.25/x
  3. Step 3: Cross multiply
    157,638.71x = 217,484.56 × 121,351.25
  4. Step 4: Simplify right side
    157,638.71x = 26,392,023,211.70
  5. Step 5: Solve for x
    x = 26,392,023,211.70/157,638.71
  6. Step 6: Final answer
    x = 167,420.95

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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.