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Finding the Fourth Proportional to 1,043.26, 1,438.95 and 711.16

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Solution

The fourth proportional to 1,043.26, 1,438.95 and 711.16 is: 980.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.26 : 1,438.95 = 711.16 : x
  2. Step 2: Convert to fraction form
    1,043.26/1,438.95 = 711.16/x
  3. Step 3: Cross multiply
    1,043.26x = 1,438.95 × 711.16
  4. Step 4: Simplify right side
    1,043.26x = 1,023,323.68
  5. Step 5: Solve for x
    x = 1,023,323.68/1,043.26
  6. Step 6: Final answer
    x = 980.89

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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.