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Finding the Fourth Proportional to 790.72, 1,091.16 and 459.12

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Solution

The fourth proportional to 790.72, 1,091.16 and 459.12 is: 633.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.72 : 1,091.16 = 459.12 : x
  2. Step 2: Convert to fraction form
    790.72/1,091.16 = 459.12/x
  3. Step 3: Cross multiply
    790.72x = 1,091.16 × 459.12
  4. Step 4: Simplify right side
    790.72x = 500,973.38
  5. Step 5: Solve for x
    x = 500,973.38/790.72
  6. Step 6: Final answer
    x = 633.57

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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.