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Finding the Fourth Proportional to 714.30, 985.92 and 640.49

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Solution

The fourth proportional to 714.30, 985.92 and 640.49 is: 884.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.30 : 985.92 = 640.49 : x
  2. Step 2: Convert to fraction form
    714.30/985.92 = 640.49/x
  3. Step 3: Cross multiply
    714.30x = 985.92 × 640.49
  4. Step 4: Simplify right side
    714.30x = 631,466.97
  5. Step 5: Solve for x
    x = 631,466.97/714.30
  6. Step 6: Final answer
    x = 884.04

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1.5x scale

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.