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Finding the Fourth Proportional to 71,173.70, 98,216.72 and 42,120.90

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Solution

The fourth proportional to 71,173.70, 98,216.72 and 42,120.90 is: 58,125.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,173.70 : 98,216.72 = 42,120.90 : x
  2. Step 2: Convert to fraction form
    71,173.70/98,216.72 = 42,120.90/x
  3. Step 3: Cross multiply
    71,173.70x = 98,216.72 × 42,120.90
  4. Step 4: Simplify right side
    71,173.70x = 4,136,977,115.06
  5. Step 5: Solve for x
    x = 4,136,977,115.06/71,173.70
  6. Step 6: Final answer
    x = 58,125.08

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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.