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Finding the Fourth Proportional to 977.28, 1,348.96 and 646

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Solution

The fourth proportional to 977.28, 1,348.96 and 646 is: 891.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.28 : 1,348.96 = 646 : x
  2. Step 2: Convert to fraction form
    977.28/1,348.96 = 646/x
  3. Step 3: Cross multiply
    977.28x = 1,348.96 × 646
  4. Step 4: Simplify right side
    977.28x = 871,428.16
  5. Step 5: Solve for x
    x = 871,428.16/977.28
  6. Step 6: Final answer
    x = 891.69

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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.