Home / 13,128.34-18,117.26-7,159.99

Finding the Fourth Proportional to 13,128.34, 18,117.26 and 7,159.99

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Solution

The fourth proportional to 13,128.34, 18,117.26 and 7,159.99 is: 9,880.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.34 : 18,117.26 = 7,159.99 : x
  2. Step 2: Convert to fraction form
    13,128.34/18,117.26 = 7,159.99/x
  3. Step 3: Cross multiply
    13,128.34x = 18,117.26 × 7,159.99
  4. Step 4: Simplify right side
    13,128.34x = 129,719,400.43
  5. Step 5: Solve for x
    x = 129,719,400.43/13,128.34
  6. Step 6: Final answer
    x = 9,880.87

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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.