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Finding the Fourth Proportional to 1,063.18, 1,467.20 and 643.46

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Solution

The fourth proportional to 1,063.18, 1,467.20 and 643.46 is: 887.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,063.18 : 1,467.20 = 643.46 : x
  2. Step 2: Convert to fraction form
    1,063.18/1,467.20 = 643.46/x
  3. Step 3: Cross multiply
    1,063.18x = 1,467.20 × 643.46
  4. Step 4: Simplify right side
    1,063.18x = 944,078.78
  5. Step 5: Solve for x
    x = 944,078.78/1,063.18
  6. Step 6: Final answer
    x = 887.98

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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.