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Finding the Fourth Proportional to 699.06, 1,047.90 and 391.26

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Solution

The fourth proportional to 699.06, 1,047.90 and 391.26 is: 586.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.06 : 1,047.90 = 391.26 : x
  2. Step 2: Convert to fraction form
    699.06/1,047.90 = 391.26/x
  3. Step 3: Cross multiply
    699.06x = 1,047.90 × 391.26
  4. Step 4: Simplify right side
    699.06x = 410,001.35
  5. Step 5: Solve for x
    x = 410,001.35/699.06
  6. Step 6: Final answer
    x = 586.50

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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.