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Finding the Fourth Proportional to 5,287.80, 7,931.70 and 1,590.60

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Solution

The fourth proportional to 5,287.80, 7,931.70 and 1,590.60 is: 2,385.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,287.80 : 7,931.70 = 1,590.60 : x
  2. Step 2: Convert to fraction form
    5,287.80/7,931.70 = 1,590.60/x
  3. Step 3: Cross multiply
    5,287.80x = 7,931.70 × 1,590.60
  4. Step 4: Simplify right side
    5,287.80x = 12,616,162.02
  5. Step 5: Solve for x
    x = 12,616,162.02/5,287.80
  6. Step 6: Final answer
    x = 2,385.90

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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.