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Finding the Fourth Proportional to 630.75, 870.44 and 368.78

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Solution

The fourth proportional to 630.75, 870.44 and 368.78 is: 508.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.75 : 870.44 = 368.78 : x
  2. Step 2: Convert to fraction form
    630.75/870.44 = 368.78/x
  3. Step 3: Cross multiply
    630.75x = 870.44 × 368.78
  4. Step 4: Simplify right side
    630.75x = 320,994.67
  5. Step 5: Solve for x
    x = 320,994.67/630.75
  6. Step 6: Final answer
    x = 508.91

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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.