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Finding the Fourth Proportional to 977.63, 1,349.12 and 667.13

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Solution

The fourth proportional to 977.63, 1,349.12 and 667.13 is: 920.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.63 : 1,349.12 = 667.13 : x
  2. Step 2: Convert to fraction form
    977.63/1,349.12 = 667.13/x
  3. Step 3: Cross multiply
    977.63x = 1,349.12 × 667.13
  4. Step 4: Simplify right side
    977.63x = 900,033.35
  5. Step 5: Solve for x
    x = 900,033.35/977.63
  6. Step 6: Final answer
    x = 920.63

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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.