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Finding the Fourth Proportional to 688.91, 1,038.11 and 569.85

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Solution

The fourth proportional to 688.91, 1,038.11 and 569.85 is: 858.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.91 : 1,038.11 = 569.85 : x
  2. Step 2: Convert to fraction form
    688.91/1,038.11 = 569.85/x
  3. Step 3: Cross multiply
    688.91x = 1,038.11 × 569.85
  4. Step 4: Simplify right side
    688.91x = 591,565.56
  5. Step 5: Solve for x
    x = 591,565.56/688.91
  6. Step 6: Final answer
    x = 858.70

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.