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Finding the Fourth Proportional to 15,135.60, 20,887.07 and 8,421.87

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Solution

The fourth proportional to 15,135.60, 20,887.07 and 8,421.87 is: 11,622.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,135.60 : 20,887.07 = 8,421.87 : x
  2. Step 2: Convert to fraction form
    15,135.60/20,887.07 = 8,421.87/x
  3. Step 3: Cross multiply
    15,135.60x = 20,887.07 × 8,421.87
  4. Step 4: Simplify right side
    15,135.60x = 175,908,146.11
  5. Step 5: Solve for x
    x = 175,908,146.11/15,135.60
  6. Step 6: Final answer
    x = 11,622.15

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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.