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Finding the Fourth Proportional to 5,317.92, 7,978.88 and 2,580

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Solution

The fourth proportional to 5,317.92, 7,978.88 and 2,580 is: 3,870.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,317.92 : 7,978.88 = 2,580 : x
  2. Step 2: Convert to fraction form
    5,317.92/7,978.88 = 2,580/x
  3. Step 3: Cross multiply
    5,317.92x = 7,978.88 × 2,580
  4. Step 4: Simplify right side
    5,317.92x = 20,585,510.40
  5. Step 5: Solve for x
    x = 20,585,510.40/5,317.92
  6. Step 6: Final answer
    x = 3,870.97

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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.