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Finding the Fourth Proportional to 565.30, 780.33 and 489.28

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Solution

The fourth proportional to 565.30, 780.33 and 489.28 is: 675.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    565.30 : 780.33 = 489.28 : x
  2. Step 2: Convert to fraction form
    565.30/780.33 = 489.28/x
  3. Step 3: Cross multiply
    565.30x = 780.33 × 489.28
  4. Step 4: Simplify right side
    565.30x = 381,799.86
  5. Step 5: Solve for x
    x = 381,799.86/565.30
  6. Step 6: Final answer
    x = 675.39

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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.