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Finding the Fourth Proportional to 15,158.86, 20,911.70 and 10,129.82

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Solution

The fourth proportional to 15,158.86, 20,911.70 and 10,129.82 is: 13,974.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,158.86 : 20,911.70 = 10,129.82 : x
  2. Step 2: Convert to fraction form
    15,158.86/20,911.70 = 10,129.82/x
  3. Step 3: Cross multiply
    15,158.86x = 20,911.70 × 10,129.82
  4. Step 4: Simplify right side
    15,158.86x = 211,831,795.29
  5. Step 5: Solve for x
    x = 211,831,795.29/15,158.86
  6. Step 6: Final answer
    x = 13,974.13

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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.