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Finding the Fourth Proportional to 5,287.68, 7,931.52 and 1,392.39

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Solution

The fourth proportional to 5,287.68, 7,931.52 and 1,392.39 is: 2,088.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,287.68 : 7,931.52 = 1,392.39 : x
  2. Step 2: Convert to fraction form
    5,287.68/7,931.52 = 1,392.39/x
  3. Step 3: Cross multiply
    5,287.68x = 7,931.52 × 1,392.39
  4. Step 4: Simplify right side
    5,287.68x = 11,043,769.13
  5. Step 5: Solve for x
    x = 11,043,769.13/5,287.68
  6. Step 6: Final answer
    x = 2,088.59

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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.