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Finding the Fourth Proportional to 12,657.86, 18,987.30 and 4,759.55

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Solution

The fourth proportional to 12,657.86, 18,987.30 and 4,759.55 is: 7,139.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,657.86 : 18,987.30 = 4,759.55 : x
  2. Step 2: Convert to fraction form
    12,657.86/18,987.30 = 4,759.55/x
  3. Step 3: Cross multiply
    12,657.86x = 18,987.30 × 4,759.55
  4. Step 4: Simplify right side
    12,657.86x = 90,371,003.72
  5. Step 5: Solve for x
    x = 90,371,003.72/12,657.86
  6. Step 6: Final answer
    x = 7,139.52

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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.