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Finding the Fourth Proportional to 691.07, 1,038.94 and 383.48

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Solution

The fourth proportional to 691.07, 1,038.94 and 383.48 is: 576.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.07 : 1,038.94 = 383.48 : x
  2. Step 2: Convert to fraction form
    691.07/1,038.94 = 383.48/x
  3. Step 3: Cross multiply
    691.07x = 1,038.94 × 383.48
  4. Step 4: Simplify right side
    691.07x = 398,406.56
  5. Step 5: Solve for x
    x = 398,406.56/691.07
  6. Step 6: Final answer
    x = 576.50

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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.