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Finding the Fourth Proportional to 691.91, 1,038.19 and 345.27

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Solution

The fourth proportional to 691.91, 1,038.19 and 345.27 is: 518.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.91 : 1,038.19 = 345.27 : x
  2. Step 2: Convert to fraction form
    691.91/1,038.19 = 345.27/x
  3. Step 3: Cross multiply
    691.91x = 1,038.19 × 345.27
  4. Step 4: Simplify right side
    691.91x = 358,455.86
  5. Step 5: Solve for x
    x = 358,455.86/691.91
  6. Step 6: Final answer
    x = 518.07

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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.