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Finding the Fourth Proportional to 948.68, 1,308.42 and 653.88

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Solution

The fourth proportional to 948.68, 1,308.42 and 653.88 is: 901.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.68 : 1,308.42 = 653.88 : x
  2. Step 2: Convert to fraction form
    948.68/1,308.42 = 653.88/x
  3. Step 3: Cross multiply
    948.68x = 1,308.42 × 653.88
  4. Step 4: Simplify right side
    948.68x = 855,549.67
  5. Step 5: Solve for x
    x = 855,549.67/948.68
  6. Step 6: Final answer
    x = 901.83

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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.