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Finding the Fourth Proportional to 909.12, 1,253.88 and 660.40

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Solution

The fourth proportional to 909.12, 1,253.88 and 660.40 is: 910.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.12 : 1,253.88 = 660.40 : x
  2. Step 2: Convert to fraction form
    909.12/1,253.88 = 660.40/x
  3. Step 3: Cross multiply
    909.12x = 1,253.88 × 660.40
  4. Step 4: Simplify right side
    909.12x = 828,062.35
  5. Step 5: Solve for x
    x = 828,062.35/909.12
  6. Step 6: Final answer
    x = 910.84

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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.