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Finding the Fourth Proportional to 1,130.41, 1,695.78 and 399.86

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Solution

The fourth proportional to 1,130.41, 1,695.78 and 399.86 is: 599.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.41 : 1,695.78 = 399.86 : x
  2. Step 2: Convert to fraction form
    1,130.41/1,695.78 = 399.86/x
  3. Step 3: Cross multiply
    1,130.41x = 1,695.78 × 399.86
  4. Step 4: Simplify right side
    1,130.41x = 678,074.59
  5. Step 5: Solve for x
    x = 678,074.59/1,130.41
  6. Step 6: Final answer
    x = 599.85

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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.