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Finding the Fourth Proportional to 5,287.59, 7,931.40 and 1,590.21

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Solution

The fourth proportional to 5,287.59, 7,931.40 and 1,590.21 is: 2,385.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,287.59 : 7,931.40 = 1,590.21 : x
  2. Step 2: Convert to fraction form
    5,287.59/7,931.40 = 1,590.21/x
  3. Step 3: Cross multiply
    5,287.59x = 7,931.40 × 1,590.21
  4. Step 4: Simplify right side
    5,287.59x = 12,612,591.59
  5. Step 5: Solve for x
    x = 12,612,591.59/5,287.59
  6. Step 6: Final answer
    x = 2,385.32

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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.