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Finding the Fourth Proportional to 1,137.20, 1,705.16 and 478.37

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Solution

The fourth proportional to 1,137.20, 1,705.16 and 478.37 is: 717.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.20 : 1,705.16 = 478.37 : x
  2. Step 2: Convert to fraction form
    1,137.20/1,705.16 = 478.37/x
  3. Step 3: Cross multiply
    1,137.20x = 1,705.16 × 478.37
  4. Step 4: Simplify right side
    1,137.20x = 815,688.86
  5. Step 5: Solve for x
    x = 815,688.86/1,137.20
  6. Step 6: Final answer
    x = 717.28

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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.