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Finding the Fourth Proportional to 981.78, 1,354.91 and 583.47

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Solution

The fourth proportional to 981.78, 1,354.91 and 583.47 is: 805.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.78 : 1,354.91 = 583.47 : x
  2. Step 2: Convert to fraction form
    981.78/1,354.91 = 583.47/x
  3. Step 3: Cross multiply
    981.78x = 1,354.91 × 583.47
  4. Step 4: Simplify right side
    981.78x = 790,546.42
  5. Step 5: Solve for x
    x = 790,546.42/981.78
  6. Step 6: Final answer
    x = 805.22

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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.