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Finding the Fourth Proportional to 1,011.10, 1,513.80 and 644.98

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Solution

The fourth proportional to 1,011.10, 1,513.80 and 644.98 is: 965.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.10 : 1,513.80 = 644.98 : x
  2. Step 2: Convert to fraction form
    1,011.10/1,513.80 = 644.98/x
  3. Step 3: Cross multiply
    1,011.10x = 1,513.80 × 644.98
  4. Step 4: Simplify right side
    1,011.10x = 976,370.72
  5. Step 5: Solve for x
    x = 976,370.72/1,011.10
  6. Step 6: Final answer
    x = 965.65

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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.