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Finding the Fourth Proportional to 977.38, 1,349.88 and 647.26

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Solution

The fourth proportional to 977.38, 1,349.88 and 647.26 is: 893.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.38 : 1,349.88 = 647.26 : x
  2. Step 2: Convert to fraction form
    977.38/1,349.88 = 647.26/x
  3. Step 3: Cross multiply
    977.38x = 1,349.88 × 647.26
  4. Step 4: Simplify right side
    977.38x = 873,723.33
  5. Step 5: Solve for x
    x = 873,723.33/977.38
  6. Step 6: Final answer
    x = 893.94

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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.