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Finding the Fourth Proportional to 113,638.95, 156,920.90 and 71,270.55

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Solution

The fourth proportional to 113,638.95, 156,920.90 and 71,270.55 is: 98,415.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,638.95 : 156,920.90 = 71,270.55 : x
  2. Step 2: Convert to fraction form
    113,638.95/156,920.90 = 71,270.55/x
  3. Step 3: Cross multiply
    113,638.95x = 156,920.90 × 71,270.55
  4. Step 4: Simplify right side
    113,638.95x = 11,183,838,493.14
  5. Step 5: Solve for x
    x = 11,183,838,493.14/113,638.95
  6. Step 6: Final answer
    x = 98,415.54

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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.