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Finding the Fourth Proportional to 1,379.77, 2,069.76 and 558.05

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Solution

The fourth proportional to 1,379.77, 2,069.76 and 558.05 is: 837.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.77 : 2,069.76 = 558.05 : x
  2. Step 2: Convert to fraction form
    1,379.77/2,069.76 = 558.05/x
  3. Step 3: Cross multiply
    1,379.77x = 2,069.76 × 558.05
  4. Step 4: Simplify right side
    1,379.77x = 1,155,029.57
  5. Step 5: Solve for x
    x = 1,155,029.57/1,379.77
  6. Step 6: Final answer
    x = 837.12

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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.