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Finding the Fourth Proportional to 630.76, 870.46 and 394.58

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Solution

The fourth proportional to 630.76, 870.46 and 394.58 is: 544.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.76 : 870.46 = 394.58 : x
  2. Step 2: Convert to fraction form
    630.76/870.46 = 394.58/x
  3. Step 3: Cross multiply
    630.76x = 870.46 × 394.58
  4. Step 4: Simplify right side
    630.76x = 343,466.11
  5. Step 5: Solve for x
    x = 343,466.11/630.76
  6. Step 6: Final answer
    x = 544.53

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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.