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Finding the Fourth Proportional to 15,124.20, 20,871.48 and 9,155.91

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Solution

The fourth proportional to 15,124.20, 20,871.48 and 9,155.91 is: 12,635.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,124.20 : 20,871.48 = 9,155.91 : x
  2. Step 2: Convert to fraction form
    15,124.20/20,871.48 = 9,155.91/x
  3. Step 3: Cross multiply
    15,124.20x = 20,871.48 × 9,155.91
  4. Step 4: Simplify right side
    15,124.20x = 191,097,392.45
  5. Step 5: Solve for x
    x = 191,097,392.45/15,124.20
  6. Step 6: Final answer
    x = 12,635.21

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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.