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Finding the Fourth Proportional to 6,659.75, 9,987.88 and 1,978.65

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Solution

The fourth proportional to 6,659.75, 9,987.88 and 1,978.65 is: 2,967.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,659.75 : 9,987.88 = 1,978.65 : x
  2. Step 2: Convert to fraction form
    6,659.75/9,987.88 = 1,978.65/x
  3. Step 3: Cross multiply
    6,659.75x = 9,987.88 × 1,978.65
  4. Step 4: Simplify right side
    6,659.75x = 19,762,543.73
  5. Step 5: Solve for x
    x = 19,762,543.73/6,659.75
  6. Step 6: Final answer
    x = 2,967.46

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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.