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Finding the Fourth Proportional to 945.91, 1,418.88 and 390.61

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Solution

The fourth proportional to 945.91, 1,418.88 and 390.61 is: 585.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    945.91 : 1,418.88 = 390.61 : x
  2. Step 2: Convert to fraction form
    945.91/1,418.88 = 390.61/x
  3. Step 3: Cross multiply
    945.91x = 1,418.88 × 390.61
  4. Step 4: Simplify right side
    945.91x = 554,228.72
  5. Step 5: Solve for x
    x = 554,228.72/945.91
  6. Step 6: Final answer
    x = 585.92

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Double scale
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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.