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Finding the Fourth Proportional to 820.58, 1,132.13 and 489.07

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Solution

The fourth proportional to 820.58, 1,132.13 and 489.07 is: 674.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.58 : 1,132.13 = 489.07 : x
  2. Step 2: Convert to fraction form
    820.58/1,132.13 = 489.07/x
  3. Step 3: Cross multiply
    820.58x = 1,132.13 × 489.07
  4. Step 4: Simplify right side
    820.58x = 553,682.71
  5. Step 5: Solve for x
    x = 553,682.71/820.58
  6. Step 6: Final answer
    x = 674.75

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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.