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Finding the Fourth Proportional to 977.93, 1,349.90 and 646.80

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Solution

The fourth proportional to 977.93, 1,349.90 and 646.80 is: 892.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.93 : 1,349.90 = 646.80 : x
  2. Step 2: Convert to fraction form
    977.93/1,349.90 = 646.80/x
  3. Step 3: Cross multiply
    977.93x = 1,349.90 × 646.80
  4. Step 4: Simplify right side
    977.93x = 873,116.94
  5. Step 5: Solve for x
    x = 873,116.94/977.93
  6. Step 6: Final answer
    x = 892.83

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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.