Home / 13,128.18-18,116.31-7,159.74

Finding the Fourth Proportional to 13,128.18, 18,116.31 and 7,159.74

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Solution

The fourth proportional to 13,128.18, 18,116.31 and 7,159.74 is: 9,880.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.18 : 18,116.31 = 7,159.74 : x
  2. Step 2: Convert to fraction form
    13,128.18/18,116.31 = 7,159.74/x
  3. Step 3: Cross multiply
    13,128.18x = 18,116.31 × 7,159.74
  4. Step 4: Simplify right side
    13,128.18x = 129,708,069.36
  5. Step 5: Solve for x
    x = 129,708,069.36/13,128.18
  6. Step 6: Final answer
    x = 9,880.13

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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.