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Finding the Fourth Proportional to 969.20, 1,337.45 and 570.85

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Solution

The fourth proportional to 969.20, 1,337.45 and 570.85 is: 787.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.20 : 1,337.45 = 570.85 : x
  2. Step 2: Convert to fraction form
    969.20/1,337.45 = 570.85/x
  3. Step 3: Cross multiply
    969.20x = 1,337.45 × 570.85
  4. Step 4: Simplify right side
    969.20x = 763,477.13
  5. Step 5: Solve for x
    x = 763,477.13/969.20
  6. Step 6: Final answer
    x = 787.74

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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.