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Finding the Fourth Proportional to 977.67, 1,349.56 and 646.55

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Solution

The fourth proportional to 977.67, 1,349.56 and 646.55 is: 892.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.67 : 1,349.56 = 646.55 : x
  2. Step 2: Convert to fraction form
    977.67/1,349.56 = 646.55/x
  3. Step 3: Cross multiply
    977.67x = 1,349.56 × 646.55
  4. Step 4: Simplify right side
    977.67x = 872,558.02
  5. Step 5: Solve for x
    x = 872,558.02/977.67
  6. Step 6: Final answer
    x = 892.49

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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.