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Finding the Fourth Proportional to 1,011.41, 1,513.90 and 663.92

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Solution

The fourth proportional to 1,011.41, 1,513.90 and 663.92 is: 993.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.41 : 1,513.90 = 663.92 : x
  2. Step 2: Convert to fraction form
    1,011.41/1,513.90 = 663.92/x
  3. Step 3: Cross multiply
    1,011.41x = 1,513.90 × 663.92
  4. Step 4: Simplify right side
    1,011.41x = 1,005,108.49
  5. Step 5: Solve for x
    x = 1,005,108.49/1,011.41
  6. Step 6: Final answer
    x = 993.77

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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.