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Finding the Fourth Proportional to 862.58, 1,190.39 and 508.74

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Solution

The fourth proportional to 862.58, 1,190.39 and 508.74 is: 702.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.58 : 1,190.39 = 508.74 : x
  2. Step 2: Convert to fraction form
    862.58/1,190.39 = 508.74/x
  3. Step 3: Cross multiply
    862.58x = 1,190.39 × 508.74
  4. Step 4: Simplify right side
    862.58x = 605,596.46
  5. Step 5: Solve for x
    x = 605,596.46/862.58
  6. Step 6: Final answer
    x = 702.08

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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.