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Finding the Fourth Proportional to 83,213.70, 124,820.55 and 51,720.90

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Solution

The fourth proportional to 83,213.70, 124,820.55 and 51,720.90 is: 77,581.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,213.70 : 124,820.55 = 51,720.90 : x
  2. Step 2: Convert to fraction form
    83,213.70/124,820.55 = 51,720.90/x
  3. Step 3: Cross multiply
    83,213.70x = 124,820.55 × 51,720.90
  4. Step 4: Simplify right side
    83,213.70x = 6,455,831,184.50
  5. Step 5: Solve for x
    x = 6,455,831,184.50/83,213.70
  6. Step 6: Final answer
    x = 77,581.35

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Similar ratio
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1.5x scale

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.