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Finding the Fourth Proportional to 10,668.88, 14,729.16 and 7,143.76

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Solution

The fourth proportional to 10,668.88, 14,729.16 and 7,143.76 is: 9,862.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,668.88 : 14,729.16 = 7,143.76 : x
  2. Step 2: Convert to fraction form
    10,668.88/14,729.16 = 7,143.76/x
  3. Step 3: Cross multiply
    10,668.88x = 14,729.16 × 7,143.76
  4. Step 4: Simplify right side
    10,668.88x = 105,221,584.04
  5. Step 5: Solve for x
    x = 105,221,584.04/10,668.88
  6. Step 6: Final answer
    x = 9,862.48

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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.