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Finding the Fourth Proportional to 18,910.80, 28,359.72 and 9,061.20

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Solution

The fourth proportional to 18,910.80, 28,359.72 and 9,061.20 is: 13,588.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,910.80 : 28,359.72 = 9,061.20 : x
  2. Step 2: Convert to fraction form
    18,910.80/28,359.72 = 9,061.20/x
  3. Step 3: Cross multiply
    18,910.80x = 28,359.72 × 9,061.20
  4. Step 4: Simplify right side
    18,910.80x = 256,973,094.86
  5. Step 5: Solve for x
    x = 256,973,094.86/18,910.80
  6. Step 6: Final answer
    x = 13,588.70

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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.