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Finding the Fourth Proportional to 977.31, 1,348.12 and 578.83

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Solution

The fourth proportional to 977.31, 1,348.12 and 578.83 is: 798.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.31 : 1,348.12 = 578.83 : x
  2. Step 2: Convert to fraction form
    977.31/1,348.12 = 578.83/x
  3. Step 3: Cross multiply
    977.31x = 1,348.12 × 578.83
  4. Step 4: Simplify right side
    977.31x = 780,332.30
  5. Step 5: Solve for x
    x = 780,332.30/977.31
  6. Step 6: Final answer
    x = 798.45

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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.