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Finding the Fourth Proportional to 7,287.40, 10,931.10 and 3,126.70

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Solution

The fourth proportional to 7,287.40, 10,931.10 and 3,126.70 is: 4,690.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,287.40 : 10,931.10 = 3,126.70 : x
  2. Step 2: Convert to fraction form
    7,287.40/10,931.10 = 3,126.70/x
  3. Step 3: Cross multiply
    7,287.40x = 10,931.10 × 3,126.70
  4. Step 4: Simplify right side
    7,287.40x = 34,178,270.37
  5. Step 5: Solve for x
    x = 34,178,270.37/7,287.40
  6. Step 6: Final answer
    x = 4,690.05

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.