Home / 13,685.16-18,872.91-8,640.66

Finding the Fourth Proportional to 13,685.16, 18,872.91 and 8,640.66

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Solution

The fourth proportional to 13,685.16, 18,872.91 and 8,640.66 is: 11,916.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,685.16 : 18,872.91 = 8,640.66 : x
  2. Step 2: Convert to fraction form
    13,685.16/18,872.91 = 8,640.66/x
  3. Step 3: Cross multiply
    13,685.16x = 18,872.91 × 8,640.66
  4. Step 4: Simplify right side
    13,685.16x = 163,074,398.52
  5. Step 5: Solve for x
    x = 163,074,398.52/13,685.16
  6. Step 6: Final answer
    x = 11,916.15

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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.