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Finding the Fourth Proportional to 1,438.80, 1,985.47 and 880.20

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Solution

The fourth proportional to 1,438.80, 1,985.47 and 880.20 is: 1,214.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.80 : 1,985.47 = 880.20 : x
  2. Step 2: Convert to fraction form
    1,438.80/1,985.47 = 880.20/x
  3. Step 3: Cross multiply
    1,438.80x = 1,985.47 × 880.20
  4. Step 4: Simplify right side
    1,438.80x = 1,747,610.69
  5. Step 5: Solve for x
    x = 1,747,610.69/1,438.80
  6. Step 6: Final answer
    x = 1,214.63

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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.