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Finding the Fourth Proportional to 981.42, 1,470.45 and 518.20

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Solution

The fourth proportional to 981.42, 1,470.45 and 518.20 is: 776.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.42 : 1,470.45 = 518.20 : x
  2. Step 2: Convert to fraction form
    981.42/1,470.45 = 518.20/x
  3. Step 3: Cross multiply
    981.42x = 1,470.45 × 518.20
  4. Step 4: Simplify right side
    981.42x = 761,985.46
  5. Step 5: Solve for x
    x = 761,985.46/981.42
  6. Step 6: Final answer
    x = 776.41

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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.