Home / 12,478.39-18,718.40-3,712.57

Finding the Fourth Proportional to 12,478.39, 18,718.40 and 3,712.57

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Solution

The fourth proportional to 12,478.39, 18,718.40 and 3,712.57 is: 5,569.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,478.39 : 18,718.40 = 3,712.57 : x
  2. Step 2: Convert to fraction form
    12,478.39/18,718.40 = 3,712.57/x
  3. Step 3: Cross multiply
    12,478.39x = 18,718.40 × 3,712.57
  4. Step 4: Simplify right side
    12,478.39x = 69,493,370.29
  5. Step 5: Solve for x
    x = 69,493,370.29/12,478.39
  6. Step 6: Final answer
    x = 5,569.10

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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.