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Finding the Fourth Proportional to 691, 955.38 and 660.40

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Solution

The fourth proportional to 691, 955.38 and 660.40 is: 913.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    691 : 955.38 = 660.40 : x
  2. Step 2: Convert to fraction form
    691/955.38 = 660.40/x
  3. Step 3: Cross multiply
    691x = 955.38 × 660.40
  4. Step 4: Simplify right side
    691x = 630,932.95
  5. Step 5: Solve for x
    x = 630,932.95/691
  6. Step 6: Final answer
    x = 913.07

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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.