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Finding the Fourth Proportional to 710.46, 979.77 and 489.06

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Solution

The fourth proportional to 710.46, 979.77 and 489.06 is: 674.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.46 : 979.77 = 489.06 : x
  2. Step 2: Convert to fraction form
    710.46/979.77 = 489.06/x
  3. Step 3: Cross multiply
    710.46x = 979.77 × 489.06
  4. Step 4: Simplify right side
    710.46x = 479,166.32
  5. Step 5: Solve for x
    x = 479,166.32/710.46
  6. Step 6: Final answer
    x = 674.45

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1.5x scale

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.