Home / 9,121.46-12,587.78-5,345.70

Finding the Fourth Proportional to 9,121.46, 12,587.78 and 5,345.70

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Solution

The fourth proportional to 9,121.46, 12,587.78 and 5,345.70 is: 7,377.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,121.46 : 12,587.78 = 5,345.70 : x
  2. Step 2: Convert to fraction form
    9,121.46/12,587.78 = 5,345.70/x
  3. Step 3: Cross multiply
    9,121.46x = 12,587.78 × 5,345.70
  4. Step 4: Simplify right side
    9,121.46x = 67,290,446.67
  5. Step 5: Solve for x
    x = 67,290,446.67/9,121.46
  6. Step 6: Final answer
    x = 7,377.16

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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.