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Finding the Fourth Proportional to 699.07, 1,048.50 and 390.73

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Solution

The fourth proportional to 699.07, 1,048.50 and 390.73 is: 586.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.07 : 1,048.50 = 390.73 : x
  2. Step 2: Convert to fraction form
    699.07/1,048.50 = 390.73/x
  3. Step 3: Cross multiply
    699.07x = 1,048.50 × 390.73
  4. Step 4: Simplify right side
    699.07x = 409,677.78
  5. Step 5: Solve for x
    x = 409,677.78/699.07
  6. Step 6: Final answer
    x = 586.03

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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.