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Finding the Fourth Proportional to 948.62, 1,308.12 and 649.55

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Solution

The fourth proportional to 948.62, 1,308.12 and 649.55 is: 895.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.62 : 1,308.12 = 649.55 : x
  2. Step 2: Convert to fraction form
    948.62/1,308.12 = 649.55/x
  3. Step 3: Cross multiply
    948.62x = 1,308.12 × 649.55
  4. Step 4: Simplify right side
    948.62x = 849,689.35
  5. Step 5: Solve for x
    x = 849,689.35/948.62
  6. Step 6: Final answer
    x = 895.71

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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.