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Finding the Fourth Proportional to 630.76, 870.38 and 368.76

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Solution

The fourth proportional to 630.76, 870.38 and 368.76 is: 508.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.76 : 870.38 = 368.76 : x
  2. Step 2: Convert to fraction form
    630.76/870.38 = 368.76/x
  3. Step 3: Cross multiply
    630.76x = 870.38 × 368.76
  4. Step 4: Simplify right side
    630.76x = 320,961.33
  5. Step 5: Solve for x
    x = 320,961.33/630.76
  6. Step 6: Final answer
    x = 508.85

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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.