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Finding the Fourth Proportional to 961.71, 1,442.16 and 653.64

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Solution

The fourth proportional to 961.71, 1,442.16 and 653.64 is: 980.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.71 : 1,442.16 = 653.64 : x
  2. Step 2: Convert to fraction form
    961.71/1,442.16 = 653.64/x
  3. Step 3: Cross multiply
    961.71x = 1,442.16 × 653.64
  4. Step 4: Simplify right side
    961.71x = 942,653.46
  5. Step 5: Solve for x
    x = 942,653.46/961.71
  6. Step 6: Final answer
    x = 980.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.