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Finding the Fourth Proportional to 977.91, 1,349.52 and 535.85

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Solution

The fourth proportional to 977.91, 1,349.52 and 535.85 is: 739.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.91 : 1,349.52 = 535.85 : x
  2. Step 2: Convert to fraction form
    977.91/1,349.52 = 535.85/x
  3. Step 3: Cross multiply
    977.91x = 1,349.52 × 535.85
  4. Step 4: Simplify right side
    977.91x = 723,140.29
  5. Step 5: Solve for x
    x = 723,140.29/977.91
  6. Step 6: Final answer
    x = 739.48

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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.