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Finding the Fourth Proportional to 926.72, 1,276.68 and 646.45

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Solution

The fourth proportional to 926.72, 1,276.68 and 646.45 is: 890.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.72 : 1,276.68 = 646.45 : x
  2. Step 2: Convert to fraction form
    926.72/1,276.68 = 646.45/x
  3. Step 3: Cross multiply
    926.72x = 1,276.68 × 646.45
  4. Step 4: Simplify right side
    926.72x = 825,306.59
  5. Step 5: Solve for x
    x = 825,306.59/926.72
  6. Step 6: Final answer
    x = 890.56

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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.