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Finding the Fourth Proportional to 790.72, 1,186.50 and 304.08

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Solution

The fourth proportional to 790.72, 1,186.50 and 304.08 is: 456.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.72 : 1,186.50 = 304.08 : x
  2. Step 2: Convert to fraction form
    790.72/1,186.50 = 304.08/x
  3. Step 3: Cross multiply
    790.72x = 1,186.50 × 304.08
  4. Step 4: Simplify right side
    790.72x = 360,790.92
  5. Step 5: Solve for x
    x = 360,790.92/790.72
  6. Step 6: Final answer
    x = 456.28

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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.