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Finding the Fourth Proportional to 977.34, 1,348.70 and 535.21

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Solution

The fourth proportional to 977.34, 1,348.70 and 535.21 is: 738.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.34 : 1,348.70 = 535.21 : x
  2. Step 2: Convert to fraction form
    977.34/1,348.70 = 535.21/x
  3. Step 3: Cross multiply
    977.34x = 1,348.70 × 535.21
  4. Step 4: Simplify right side
    977.34x = 721,837.73
  5. Step 5: Solve for x
    x = 721,837.73/977.34
  6. Step 6: Final answer
    x = 738.57

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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.