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Finding the Fourth Proportional to 980.47, 1,470.71 and 655.66

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Solution

The fourth proportional to 980.47, 1,470.71 and 655.66 is: 983.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    980.47 : 1,470.71 = 655.66 : x
  2. Step 2: Convert to fraction form
    980.47/1,470.71 = 655.66/x
  3. Step 3: Cross multiply
    980.47x = 1,470.71 × 655.66
  4. Step 4: Simplify right side
    980.47x = 964,285.72
  5. Step 5: Solve for x
    x = 964,285.72/980.47
  6. Step 6: Final answer
    x = 983.49

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1.5x scale

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.