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Finding the Fourth Proportional to 1,025.76, 1,538.45 and 440.87

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Solution

The fourth proportional to 1,025.76, 1,538.45 and 440.87 is: 661.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,025.76 : 1,538.45 = 440.87 : x
  2. Step 2: Convert to fraction form
    1,025.76/1,538.45 = 440.87/x
  3. Step 3: Cross multiply
    1,025.76x = 1,538.45 × 440.87
  4. Step 4: Simplify right side
    1,025.76x = 678,249.86
  5. Step 5: Solve for x
    x = 678,249.86/1,025.76
  6. Step 6: Final answer
    x = 661.22

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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.