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Finding the Fourth Proportional to 714.12, 1,066.04 and 621.84

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Solution

The fourth proportional to 714.12, 1,066.04 and 621.84 is: 928.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.12 : 1,066.04 = 621.84 : x
  2. Step 2: Convert to fraction form
    714.12/1,066.04 = 621.84/x
  3. Step 3: Cross multiply
    714.12x = 1,066.04 × 621.84
  4. Step 4: Simplify right side
    714.12x = 662,906.31
  5. Step 5: Solve for x
    x = 662,906.31/714.12
  6. Step 6: Final answer
    x = 928.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.