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Finding the Fourth Proportional to 1,003.36, 1,385.28 and 649.46

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Solution

The fourth proportional to 1,003.36, 1,385.28 and 649.46 is: 896.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.36 : 1,385.28 = 649.46 : x
  2. Step 2: Convert to fraction form
    1,003.36/1,385.28 = 649.46/x
  3. Step 3: Cross multiply
    1,003.36x = 1,385.28 × 649.46
  4. Step 4: Simplify right side
    1,003.36x = 899,677.02
  5. Step 5: Solve for x
    x = 899,677.02/1,003.36
  6. Step 6: Final answer
    x = 896.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.