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Finding the Fourth Proportional to 15,245.70, 21,031.95 and 9,869.87

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Solution

The fourth proportional to 15,245.70, 21,031.95 and 9,869.87 is: 13,615.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,245.70 : 21,031.95 = 9,869.87 : x
  2. Step 2: Convert to fraction form
    15,245.70/21,031.95 = 9,869.87/x
  3. Step 3: Cross multiply
    15,245.70x = 21,031.95 × 9,869.87
  4. Step 4: Simplify right side
    15,245.70x = 207,582,507.19
  5. Step 5: Solve for x
    x = 207,582,507.19/15,245.70
  6. Step 6: Final answer
    x = 13,615.81

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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.