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Finding the Fourth Proportional to 1,439.93, 1,987.08 and 880.31

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Solution

The fourth proportional to 1,439.93, 1,987.08 and 880.31 is: 1,214.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.93 : 1,987.08 = 880.31 : x
  2. Step 2: Convert to fraction form
    1,439.93/1,987.08 = 880.31/x
  3. Step 3: Cross multiply
    1,439.93x = 1,987.08 × 880.31
  4. Step 4: Simplify right side
    1,439.93x = 1,749,246.39
  5. Step 5: Solve for x
    x = 1,749,246.39/1,439.93
  6. Step 6: Final answer
    x = 1,214.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.