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Finding the Fourth Proportional to 20,842.64, 28,762.83 and 11,411.20

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Solution

The fourth proportional to 20,842.64, 28,762.83 and 11,411.20 is: 15,747.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,842.64 : 28,762.83 = 11,411.20 : x
  2. Step 2: Convert to fraction form
    20,842.64/28,762.83 = 11,411.20/x
  3. Step 3: Cross multiply
    20,842.64x = 28,762.83 × 11,411.20
  4. Step 4: Simplify right side
    20,842.64x = 328,218,405.70
  5. Step 5: Solve for x
    x = 328,218,405.70/20,842.64
  6. Step 6: Final answer
    x = 15,747.45

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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.