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Finding the Fourth Proportional to 746.08, 1,118.16 and 643.36

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Solution

The fourth proportional to 746.08, 1,118.16 and 643.36 is: 964.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    746.08 : 1,118.16 = 643.36 : x
  2. Step 2: Convert to fraction form
    746.08/1,118.16 = 643.36/x
  3. Step 3: Cross multiply
    746.08x = 1,118.16 × 643.36
  4. Step 4: Simplify right side
    746.08x = 719,379.42
  5. Step 5: Solve for x
    x = 719,379.42/746.08
  6. Step 6: Final answer
    x = 964.21

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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.