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Finding the Fourth Proportional to 12,987.92, 17,925.64 and 7,685.66

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Solution

The fourth proportional to 12,987.92, 17,925.64 and 7,685.66 is: 10,607.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,987.92 : 17,925.64 = 7,685.66 : x
  2. Step 2: Convert to fraction form
    12,987.92/17,925.64 = 7,685.66/x
  3. Step 3: Cross multiply
    12,987.92x = 17,925.64 × 7,685.66
  4. Step 4: Simplify right side
    12,987.92x = 137,770,374.32
  5. Step 5: Solve for x
    x = 137,770,374.32/12,987.92
  6. Step 6: Final answer
    x = 10,607.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.