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Finding the Fourth Proportional to 699.27, 1,047.88 and 390.66

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Solution

The fourth proportional to 699.27, 1,047.88 and 390.66 is: 585.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.27 : 1,047.88 = 390.66 : x
  2. Step 2: Convert to fraction form
    699.27/1,047.88 = 390.66/x
  3. Step 3: Cross multiply
    699.27x = 1,047.88 × 390.66
  4. Step 4: Simplify right side
    699.27x = 409,364.80
  5. Step 5: Solve for x
    x = 409,364.80/699.27
  6. Step 6: Final answer
    x = 585.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.