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Finding the Fourth Proportional to 2,657.50, 3,987.87 and 1,118.50

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Solution

The fourth proportional to 2,657.50, 3,987.87 and 1,118.50 is: 1,678.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,657.50 : 3,987.87 = 1,118.50 : x
  2. Step 2: Convert to fraction form
    2,657.50/3,987.87 = 1,118.50/x
  3. Step 3: Cross multiply
    2,657.50x = 3,987.87 × 1,118.50
  4. Step 4: Simplify right side
    2,657.50x = 4,460,432.60
  5. Step 5: Solve for x
    x = 4,460,432.60/2,657.50
  6. Step 6: Final answer
    x = 1,678.43

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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.