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Finding the Fourth Proportional to 714.10, 985.48 and 399.40

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Solution

The fourth proportional to 714.10, 985.48 and 399.40 is: 551.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.10 : 985.48 = 399.40 : x
  2. Step 2: Convert to fraction form
    714.10/985.48 = 399.40/x
  3. Step 3: Cross multiply
    714.10x = 985.48 × 399.40
  4. Step 4: Simplify right side
    714.10x = 393,600.71
  5. Step 5: Solve for x
    x = 393,600.71/714.10
  6. Step 6: Final answer
    x = 551.18

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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.