Home / 9,117.40-12,583.20-5,139.28

Finding the Fourth Proportional to 9,117.40, 12,583.20 and 5,139.28

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Solution

The fourth proportional to 9,117.40, 12,583.20 and 5,139.28 is: 7,092.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,117.40 : 12,583.20 = 5,139.28 : x
  2. Step 2: Convert to fraction form
    9,117.40/12,583.20 = 5,139.28/x
  3. Step 3: Cross multiply
    9,117.40x = 12,583.20 × 5,139.28
  4. Step 4: Simplify right side
    9,117.40x = 64,668,588.10
  5. Step 5: Solve for x
    x = 64,668,588.10/9,117.40
  6. Step 6: Final answer
    x = 7,092.88

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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.