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Finding the Fourth Proportional to 705.32, 972.50 and 489.18

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Solution

The fourth proportional to 705.32, 972.50 and 489.18 is: 674.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    705.32 : 972.50 = 489.18 : x
  2. Step 2: Convert to fraction form
    705.32/972.50 = 489.18/x
  3. Step 3: Cross multiply
    705.32x = 972.50 × 489.18
  4. Step 4: Simplify right side
    705.32x = 475,725.10
  5. Step 5: Solve for x
    x = 475,725.10/705.32
  6. Step 6: Final answer
    x = 674.49

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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.