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Finding the Fourth Proportional to 1,439.88, 2,159.36 and 465.75

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Solution

The fourth proportional to 1,439.88, 2,159.36 and 465.75 is: 698.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.88 : 2,159.36 = 465.75 : x
  2. Step 2: Convert to fraction form
    1,439.88/2,159.36 = 465.75/x
  3. Step 3: Cross multiply
    1,439.88x = 2,159.36 × 465.75
  4. Step 4: Simplify right side
    1,439.88x = 1,005,721.34
  5. Step 5: Solve for x
    x = 1,005,721.34/1,439.88
  6. Step 6: Final answer
    x = 698.48

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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.