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Finding the Fourth Proportional to 3,590.78, 5,385.96 and 993.50

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Solution

The fourth proportional to 3,590.78, 5,385.96 and 993.50 is: 1,490.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,590.78 : 5,385.96 = 993.50 : x
  2. Step 2: Convert to fraction form
    3,590.78/5,385.96 = 993.50/x
  3. Step 3: Cross multiply
    3,590.78x = 5,385.96 × 993.50
  4. Step 4: Simplify right side
    3,590.78x = 5,350,951.26
  5. Step 5: Solve for x
    x = 5,350,951.26/3,590.78
  6. Step 6: Final answer
    x = 1,490.19

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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.