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Finding the Fourth Proportional to 1,004.15, 1,505.01 and 425.81

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Solution

The fourth proportional to 1,004.15, 1,505.01 and 425.81 is: 638.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.15 : 1,505.01 = 425.81 : x
  2. Step 2: Convert to fraction form
    1,004.15/1,505.01 = 425.81/x
  3. Step 3: Cross multiply
    1,004.15x = 1,505.01 × 425.81
  4. Step 4: Simplify right side
    1,004.15x = 640,853.67
  5. Step 5: Solve for x
    x = 640,853.67/1,004.15
  6. Step 6: Final answer
    x = 638.20

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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.