Home / 11,152.78-15,378.15-9,129.76

Finding the Fourth Proportional to 11,152.78, 15,378.15 and 9,129.76

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Solution

The fourth proportional to 11,152.78, 15,378.15 and 9,129.76 is: 12,588.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,152.78 : 15,378.15 = 9,129.76 : x
  2. Step 2: Convert to fraction form
    11,152.78/15,378.15 = 9,129.76/x
  3. Step 3: Cross multiply
    11,152.78x = 15,378.15 × 9,129.76
  4. Step 4: Simplify right side
    11,152.78x = 140,398,818.74
  5. Step 5: Solve for x
    x = 140,398,818.74/11,152.78
  6. Step 6: Final answer
    x = 12,588.68

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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.