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Finding the Fourth Proportional to 956.84, 1,320.87 and 642

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Solution

The fourth proportional to 956.84, 1,320.87 and 642 is: 886.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.84 : 1,320.87 = 642 : x
  2. Step 2: Convert to fraction form
    956.84/1,320.87 = 642/x
  3. Step 3: Cross multiply
    956.84x = 1,320.87 × 642
  4. Step 4: Simplify right side
    956.84x = 847,998.54
  5. Step 5: Solve for x
    x = 847,998.54/956.84
  6. Step 6: Final answer
    x = 886.25

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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.