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Finding the Fourth Proportional to 922.40, 1,384.26 and 691.91

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Solution

The fourth proportional to 922.40, 1,384.26 and 691.91 is: 1,038.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.40 : 1,384.26 = 691.91 : x
  2. Step 2: Convert to fraction form
    922.40/1,384.26 = 691.91/x
  3. Step 3: Cross multiply
    922.40x = 1,384.26 × 691.91
  4. Step 4: Simplify right side
    922.40x = 957,776.42
  5. Step 5: Solve for x
    x = 957,776.42/922.40
  6. Step 6: Final answer
    x = 1,038.36

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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.