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Finding the Fourth Proportional to 969.72, 1,337.78 and 555.72

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Solution

The fourth proportional to 969.72, 1,337.78 and 555.72 is: 766.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.72 : 1,337.78 = 555.72 : x
  2. Step 2: Convert to fraction form
    969.72/1,337.78 = 555.72/x
  3. Step 3: Cross multiply
    969.72x = 1,337.78 × 555.72
  4. Step 4: Simplify right side
    969.72x = 743,431.10
  5. Step 5: Solve for x
    x = 743,431.10/969.72
  6. Step 6: Final answer
    x = 766.65

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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.