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Finding the Fourth Proportional to 1,137.15, 1,705.51 and 520.87

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Solution

The fourth proportional to 1,137.15, 1,705.51 and 520.87 is: 781.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.15 : 1,705.51 = 520.87 : x
  2. Step 2: Convert to fraction form
    1,137.15/1,705.51 = 520.87/x
  3. Step 3: Cross multiply
    1,137.15x = 1,705.51 × 520.87
  4. Step 4: Simplify right side
    1,137.15x = 888,348.99
  5. Step 5: Solve for x
    x = 888,348.99/1,137.15
  6. Step 6: Final answer
    x = 781.21

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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.