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Finding the Fourth Proportional to 909.14, 1,255.20 and 698.90

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Solution

The fourth proportional to 909.14, 1,255.20 and 698.90 is: 964.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.14 : 1,255.20 = 698.90 : x
  2. Step 2: Convert to fraction form
    909.14/1,255.20 = 698.90/x
  3. Step 3: Cross multiply
    909.14x = 1,255.20 × 698.90
  4. Step 4: Simplify right side
    909.14x = 877,259.28
  5. Step 5: Solve for x
    x = 877,259.28/909.14
  6. Step 6: Final answer
    x = 964.93

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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.