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Finding the Fourth Proportional to 790.51, 1,185.75 and 515.76

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Solution

The fourth proportional to 790.51, 1,185.75 and 515.76 is: 773.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.51 : 1,185.75 = 515.76 : x
  2. Step 2: Convert to fraction form
    790.51/1,185.75 = 515.76/x
  3. Step 3: Cross multiply
    790.51x = 1,185.75 × 515.76
  4. Step 4: Simplify right side
    790.51x = 611,562.42
  5. Step 5: Solve for x
    x = 611,562.42/790.51
  6. Step 6: Final answer
    x = 773.63

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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.