Home / 12,686.20-18,955.88-9,159.48

Finding the Fourth Proportional to 12,686.20, 18,955.88 and 9,159.48

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Solution

The fourth proportional to 12,686.20, 18,955.88 and 9,159.48 is: 13,686.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,686.20 : 18,955.88 = 9,159.48 : x
  2. Step 2: Convert to fraction form
    12,686.20/18,955.88 = 9,159.48/x
  3. Step 3: Cross multiply
    12,686.20x = 18,955.88 × 9,159.48
  4. Step 4: Simplify right side
    12,686.20x = 173,626,003.74
  5. Step 5: Solve for x
    x = 173,626,003.74/12,686.20
  6. Step 6: Final answer
    x = 13,686.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.