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Finding the Fourth Proportional to 905.15, 1,248.27 and 708.32

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Solution

The fourth proportional to 905.15, 1,248.27 and 708.32 is: 976.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.15 : 1,248.27 = 708.32 : x
  2. Step 2: Convert to fraction form
    905.15/1,248.27 = 708.32/x
  3. Step 3: Cross multiply
    905.15x = 1,248.27 × 708.32
  4. Step 4: Simplify right side
    905.15x = 884,174.61
  5. Step 5: Solve for x
    x = 884,174.61/905.15
  6. Step 6: Final answer
    x = 976.83

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Double scale
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1.5x scale

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.