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Finding the Fourth Proportional to 1,073.86, 1,611.80 and 708.90

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Solution

The fourth proportional to 1,073.86, 1,611.80 and 708.90 is: 1,064.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,073.86 : 1,611.80 = 708.90 : x
  2. Step 2: Convert to fraction form
    1,073.86/1,611.80 = 708.90/x
  3. Step 3: Cross multiply
    1,073.86x = 1,611.80 × 708.90
  4. Step 4: Simplify right side
    1,073.86x = 1,142,605.02
  5. Step 5: Solve for x
    x = 1,142,605.02/1,073.86
  6. Step 6: Final answer
    x = 1,064.02

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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.