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Finding the Fourth Proportional to 5,319.28, 7,976.28 and 1,987.38

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Solution

The fourth proportional to 5,319.28, 7,976.28 and 1,987.38 is: 2,980.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,319.28 : 7,976.28 = 1,987.38 : x
  2. Step 2: Convert to fraction form
    5,319.28/7,976.28 = 1,987.38/x
  3. Step 3: Cross multiply
    5,319.28x = 7,976.28 × 1,987.38
  4. Step 4: Simplify right side
    5,319.28x = 15,851,899.35
  5. Step 5: Solve for x
    x = 15,851,899.35/5,319.28
  6. Step 6: Final answer
    x = 2,980.08

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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.