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Finding the Fourth Proportional to 20,951.16, 28,913.04 and 11,520.24

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Solution

The fourth proportional to 20,951.16, 28,913.04 and 11,520.24 is: 15,898.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,951.16 : 28,913.04 = 11,520.24 : x
  2. Step 2: Convert to fraction form
    20,951.16/28,913.04 = 11,520.24/x
  3. Step 3: Cross multiply
    20,951.16x = 28,913.04 × 11,520.24
  4. Step 4: Simplify right side
    20,951.16x = 333,085,159.93
  5. Step 5: Solve for x
    x = 333,085,159.93/20,951.16
  6. Step 6: Final answer
    x = 15,898.17

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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.