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Finding the Fourth Proportional to 8,159.28, 11,216.64 and 7,020.72

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Solution

The fourth proportional to 8,159.28, 11,216.64 and 7,020.72 is: 9,651.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,159.28 : 11,216.64 = 7,020.72 : x
  2. Step 2: Convert to fraction form
    8,159.28/11,216.64 = 7,020.72/x
  3. Step 3: Cross multiply
    8,159.28x = 11,216.64 × 7,020.72
  4. Step 4: Simplify right side
    8,159.28x = 78,748,888.78
  5. Step 5: Solve for x
    x = 78,748,888.78/8,159.28
  6. Step 6: Final answer
    x = 9,651.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.