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Finding the Fourth Proportional to 15,156.17, 20,924.19 and 10,128.90

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Solution

The fourth proportional to 15,156.17, 20,924.19 and 10,128.90 is: 13,983.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,156.17 : 20,924.19 = 10,128.90 : x
  2. Step 2: Convert to fraction form
    15,156.17/20,924.19 = 10,128.90/x
  3. Step 3: Cross multiply
    15,156.17x = 20,924.19 × 10,128.90
  4. Step 4: Simplify right side
    15,156.17x = 211,939,055.08
  5. Step 5: Solve for x
    x = 211,939,055.08/15,156.17
  6. Step 6: Final answer
    x = 13,983.68

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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.