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Finding the Fourth Proportional to 1,438.83, 2,156.62 and 708.91

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Solution

The fourth proportional to 1,438.83, 2,156.62 and 708.91 is: 1,062.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438.83 : 2,156.62 = 708.91 : x
  2. Step 2: Convert to fraction form
    1,438.83/2,156.62 = 708.91/x
  3. Step 3: Cross multiply
    1,438.83x = 2,156.62 × 708.91
  4. Step 4: Simplify right side
    1,438.83x = 1,528,849.48
  5. Step 5: Solve for x
    x = 1,528,849.48/1,438.83
  6. Step 6: Final answer
    x = 1,062.56

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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.