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Finding the Fourth Proportional to 1,039.58, 1,559.58 and 423.28

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Solution

The fourth proportional to 1,039.58, 1,559.58 and 423.28 is: 635.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.58 : 1,559.58 = 423.28 : x
  2. Step 2: Convert to fraction form
    1,039.58/1,559.58 = 423.28/x
  3. Step 3: Cross multiply
    1,039.58x = 1,559.58 × 423.28
  4. Step 4: Simplify right side
    1,039.58x = 660,139.02
  5. Step 5: Solve for x
    x = 660,139.02/1,039.58
  6. Step 6: Final answer
    x = 635.01

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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.