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Finding the Fourth Proportional to 157,910.72, 217,915.52 and 86,289.44

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Solution

The fourth proportional to 157,910.72, 217,915.52 and 86,289.44 is: 119,078.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,910.72 : 217,915.52 = 86,289.44 : x
  2. Step 2: Convert to fraction form
    157,910.72/217,915.52 = 86,289.44/x
  3. Step 3: Cross multiply
    157,910.72x = 217,915.52 × 86,289.44
  4. Step 4: Simplify right side
    157,910.72x = 18,803,806,667.08
  5. Step 5: Solve for x
    x = 18,803,806,667.08/157,910.72
  6. Step 6: Final answer
    x = 119,078.73

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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.