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Finding the Fourth Proportional to 1,129.02, 1,693.76 and 399.11

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Solution

The fourth proportional to 1,129.02, 1,693.76 and 399.11 is: 598.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.02 : 1,693.76 = 399.11 : x
  2. Step 2: Convert to fraction form
    1,129.02/1,693.76 = 399.11/x
  3. Step 3: Cross multiply
    1,129.02x = 1,693.76 × 399.11
  4. Step 4: Simplify right side
    1,129.02x = 675,986.09
  5. Step 5: Solve for x
    x = 675,986.09/1,129.02
  6. Step 6: Final answer
    x = 598.74

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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.