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Finding the Fourth Proportional to 1,987.95, 2,978.76 and 1,678.35

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Solution

The fourth proportional to 1,987.95, 2,978.76 and 1,678.35 is: 2,514.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.95 : 2,978.76 = 1,678.35 : x
  2. Step 2: Convert to fraction form
    1,987.95/2,978.76 = 1,678.35/x
  3. Step 3: Cross multiply
    1,987.95x = 2,978.76 × 1,678.35
  4. Step 4: Simplify right side
    1,987.95x = 4,999,401.85
  5. Step 5: Solve for x
    x = 4,999,401.85/1,987.95
  6. Step 6: Final answer
    x = 2,514.85

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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.