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Finding the Fourth Proportional to 699, 1,047.14 and 389.92

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Solution

The fourth proportional to 699, 1,047.14 and 389.92 is: 584.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    699 : 1,047.14 = 389.92 : x
  2. Step 2: Convert to fraction form
    699/1,047.14 = 389.92/x
  3. Step 3: Cross multiply
    699x = 1,047.14 × 389.92
  4. Step 4: Simplify right side
    699x = 408,300.83
  5. Step 5: Solve for x
    x = 408,300.83/699
  6. Step 6: Final answer
    x = 584.12

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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.