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Finding the Fourth Proportional to 8,718.40, 12,032.40 and 5,181.58

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Solution

The fourth proportional to 8,718.40, 12,032.40 and 5,181.58 is: 7,151.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,718.40 : 12,032.40 = 5,181.58 : x
  2. Step 2: Convert to fraction form
    8,718.40/12,032.40 = 5,181.58/x
  3. Step 3: Cross multiply
    8,718.40x = 12,032.40 × 5,181.58
  4. Step 4: Simplify right side
    8,718.40x = 62,346,843.19
  5. Step 5: Solve for x
    x = 62,346,843.19/8,718.40
  6. Step 6: Final answer
    x = 7,151.18

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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.