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Finding the Fourth Proportional to 18,917.20, 28,332.60 and 9,672.40

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Solution

The fourth proportional to 18,917.20, 28,332.60 and 9,672.40 is: 14,486.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,917.20 : 28,332.60 = 9,672.40 : x
  2. Step 2: Convert to fraction form
    18,917.20/28,332.60 = 9,672.40/x
  3. Step 3: Cross multiply
    18,917.20x = 28,332.60 × 9,672.40
  4. Step 4: Simplify right side
    18,917.20x = 274,044,240.24
  5. Step 5: Solve for x
    x = 274,044,240.24/18,917.20
  6. Step 6: Final answer
    x = 14,486.51

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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.