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Finding the Fourth Proportional to 977.88, 1,350.93 and 642.58

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Solution

The fourth proportional to 977.88, 1,350.93 and 642.58 is: 887.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.88 : 1,350.93 = 642.58 : x
  2. Step 2: Convert to fraction form
    977.88/1,350.93 = 642.58/x
  3. Step 3: Cross multiply
    977.88x = 1,350.93 × 642.58
  4. Step 4: Simplify right side
    977.88x = 868,079.63
  5. Step 5: Solve for x
    x = 868,079.63/977.88
  6. Step 6: Final answer
    x = 887.71

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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.