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Finding the Fourth Proportional to 980.76, 1,470.76 and 706.04

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Solution

The fourth proportional to 980.76, 1,470.76 and 706.04 is: 1,058.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.76 : 1,470.76 = 706.04 : x
  2. Step 2: Convert to fraction form
    980.76/1,470.76 = 706.04/x
  3. Step 3: Cross multiply
    980.76x = 1,470.76 × 706.04
  4. Step 4: Simplify right side
    980.76x = 1,038,415.39
  5. Step 5: Solve for x
    x = 1,038,415.39/980.76
  6. Step 6: Final answer
    x = 1,058.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.