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Finding the Fourth Proportional to 808.48, 1,115.47 and 489.32

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Solution

The fourth proportional to 808.48, 1,115.47 and 489.32 is: 675.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    808.48 : 1,115.47 = 489.32 : x
  2. Step 2: Convert to fraction form
    808.48/1,115.47 = 489.32/x
  3. Step 3: Cross multiply
    808.48x = 1,115.47 × 489.32
  4. Step 4: Simplify right side
    808.48x = 545,817.86
  5. Step 5: Solve for x
    x = 545,817.86/808.48
  6. Step 6: Final answer
    x = 675.12

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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.