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Finding the Fourth Proportional to 18,987.90, 28,479.35 and 4,948.95

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Solution

The fourth proportional to 18,987.90, 28,479.35 and 4,948.95 is: 7,422.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.90 : 28,479.35 = 4,948.95 : x
  2. Step 2: Convert to fraction form
    18,987.90/28,479.35 = 4,948.95/x
  3. Step 3: Cross multiply
    18,987.90x = 28,479.35 × 4,948.95
  4. Step 4: Simplify right side
    18,987.90x = 140,942,854.44
  5. Step 5: Solve for x
    x = 140,942,854.44/18,987.90
  6. Step 6: Final answer
    x = 7,422.77

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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.