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Finding the Fourth Proportional to 873.32, 1,308.51 and 642.29

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Solution

The fourth proportional to 873.32, 1,308.51 and 642.29 is: 962.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.32 : 1,308.51 = 642.29 : x
  2. Step 2: Convert to fraction form
    873.32/1,308.51 = 642.29/x
  3. Step 3: Cross multiply
    873.32x = 1,308.51 × 642.29
  4. Step 4: Simplify right side
    873.32x = 840,436.35
  5. Step 5: Solve for x
    x = 840,436.35/873.32
  6. Step 6: Final answer
    x = 962.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.