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Finding the Fourth Proportional to 15,129.60, 20,835.84 and 10,931.20

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Solution

The fourth proportional to 15,129.60, 20,835.84 and 10,931.20 is: 15,053.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,129.60 : 20,835.84 = 10,931.20 : x
  2. Step 2: Convert to fraction form
    15,129.60/20,835.84 = 10,931.20/x
  3. Step 3: Cross multiply
    15,129.60x = 20,835.84 × 10,931.20
  4. Step 4: Simplify right side
    15,129.60x = 227,760,734.21
  5. Step 5: Solve for x
    x = 227,760,734.21/15,129.60
  6. Step 6: Final answer
    x = 15,053.98

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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.