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Finding the Fourth Proportional to 1,003.76, 1,506.16 and 426.48

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Solution

The fourth proportional to 1,003.76, 1,506.16 and 426.48 is: 639.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.76 : 1,506.16 = 426.48 : x
  2. Step 2: Convert to fraction form
    1,003.76/1,506.16 = 426.48/x
  3. Step 3: Cross multiply
    1,003.76x = 1,506.16 × 426.48
  4. Step 4: Simplify right side
    1,003.76x = 642,347.12
  5. Step 5: Solve for x
    x = 642,347.12/1,003.76
  6. Step 6: Final answer
    x = 639.94

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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.