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Finding the Fourth Proportional to 3,590.40, 5,385.64 and 993.18

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Solution

The fourth proportional to 3,590.40, 5,385.64 and 993.18 is: 1,489.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,590.40 : 5,385.64 = 993.18 : x
  2. Step 2: Convert to fraction form
    3,590.40/5,385.64 = 993.18/x
  3. Step 3: Cross multiply
    3,590.40x = 5,385.64 × 993.18
  4. Step 4: Simplify right side
    3,590.40x = 5,348,909.94
  5. Step 5: Solve for x
    x = 5,348,909.94/3,590.40
  6. Step 6: Final answer
    x = 1,489.78

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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.