Home / 13,128.12-18,116.92-7,159.74

Finding the Fourth Proportional to 13,128.12, 18,116.92 and 7,159.74

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Solution

The fourth proportional to 13,128.12, 18,116.92 and 7,159.74 is: 9,880.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.12 : 18,116.92 = 7,159.74 : x
  2. Step 2: Convert to fraction form
    13,128.12/18,116.92 = 7,159.74/x
  3. Step 3: Cross multiply
    13,128.12x = 18,116.92 × 7,159.74
  4. Step 4: Simplify right side
    13,128.12x = 129,712,436.80
  5. Step 5: Solve for x
    x = 129,712,436.80/13,128.12
  6. Step 6: Final answer
    x = 9,880.50

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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.