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Finding the Fourth Proportional to 1,661.58, 2,290.95 and 1,129.86

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Solution

The fourth proportional to 1,661.58, 2,290.95 and 1,129.86 is: 1,557.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.58 : 2,290.95 = 1,129.86 : x
  2. Step 2: Convert to fraction form
    1,661.58/2,290.95 = 1,129.86/x
  3. Step 3: Cross multiply
    1,661.58x = 2,290.95 × 1,129.86
  4. Step 4: Simplify right side
    1,661.58x = 2,588,452.77
  5. Step 5: Solve for x
    x = 2,588,452.77/1,661.58
  6. Step 6: Final answer
    x = 1,557.83

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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.