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Finding the Fourth Proportional to 698.31, 1,048.49 and 390.76

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Solution

The fourth proportional to 698.31, 1,048.49 and 390.76 is: 586.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.31 : 1,048.49 = 390.76 : x
  2. Step 2: Convert to fraction form
    698.31/1,048.49 = 390.76/x
  3. Step 3: Cross multiply
    698.31x = 1,048.49 × 390.76
  4. Step 4: Simplify right side
    698.31x = 409,706.00
  5. Step 5: Solve for x
    x = 409,706.00/698.31
  6. Step 6: Final answer
    x = 586.71

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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.