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Finding the Fourth Proportional to 948.86, 1,308.78 and 617.47

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Solution

The fourth proportional to 948.86, 1,308.78 and 617.47 is: 851.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.86 : 1,308.78 = 617.47 : x
  2. Step 2: Convert to fraction form
    948.86/1,308.78 = 617.47/x
  3. Step 3: Cross multiply
    948.86x = 1,308.78 × 617.47
  4. Step 4: Simplify right side
    948.86x = 808,129.11
  5. Step 5: Solve for x
    x = 808,129.11/948.86
  6. Step 6: Final answer
    x = 851.69

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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.