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Finding the Fourth Proportional to 907.74, 1,250.92 and 645.30

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Solution

The fourth proportional to 907.74, 1,250.92 and 645.30 is: 889.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    907.74 : 1,250.92 = 645.30 : x
  2. Step 2: Convert to fraction form
    907.74/1,250.92 = 645.30/x
  3. Step 3: Cross multiply
    907.74x = 1,250.92 × 645.30
  4. Step 4: Simplify right side
    907.74x = 807,218.68
  5. Step 5: Solve for x
    x = 807,218.68/907.74
  6. Step 6: Final answer
    x = 889.26

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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.