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Finding the Fourth Proportional to 9,986.20, 15,000.90 and 7,070.20

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Solution

The fourth proportional to 9,986.20, 15,000.90 and 7,070.20 is: 10,620.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,986.20 : 15,000.90 = 7,070.20 : x
  2. Step 2: Convert to fraction form
    9,986.20/15,000.90 = 7,070.20/x
  3. Step 3: Cross multiply
    9,986.20x = 15,000.90 × 7,070.20
  4. Step 4: Simplify right side
    9,986.20x = 106,059,363.18
  5. Step 5: Solve for x
    x = 106,059,363.18/9,986.20
  6. Step 6: Final answer
    x = 10,620.59

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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.