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Finding the Fourth Proportional to 1,439.67, 2,159.91 and 465.86

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Solution

The fourth proportional to 1,439.67, 2,159.91 and 465.86 is: 698.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.67 : 2,159.91 = 465.86 : x
  2. Step 2: Convert to fraction form
    1,439.67/2,159.91 = 465.86/x
  3. Step 3: Cross multiply
    1,439.67x = 2,159.91 × 465.86
  4. Step 4: Simplify right side
    1,439.67x = 1,006,204.87
  5. Step 5: Solve for x
    x = 1,006,204.87/1,439.67
  6. Step 6: Final answer
    x = 698.91

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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.