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Finding the Fourth Proportional to 710.76, 980.28 and 489.66

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Solution

The fourth proportional to 710.76, 980.28 and 489.66 is: 675.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.76 : 980.28 = 489.66 : x
  2. Step 2: Convert to fraction form
    710.76/980.28 = 489.66/x
  3. Step 3: Cross multiply
    710.76x = 980.28 × 489.66
  4. Step 4: Simplify right side
    710.76x = 480,003.90
  5. Step 5: Solve for x
    x = 480,003.90/710.76
  6. Step 6: Final answer
    x = 675.34

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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.