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Finding the Fourth Proportional to 948.78, 1,421.86 and 485.58

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Solution

The fourth proportional to 948.78, 1,421.86 and 485.58 is: 727.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.78 : 1,421.86 = 485.58 : x
  2. Step 2: Convert to fraction form
    948.78/1,421.86 = 485.58/x
  3. Step 3: Cross multiply
    948.78x = 1,421.86 × 485.58
  4. Step 4: Simplify right side
    948.78x = 690,426.78
  5. Step 5: Solve for x
    x = 690,426.78/948.78
  6. Step 6: Final answer
    x = 727.70

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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.