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Finding the Fourth Proportional to 790.19, 1,182.85 and 515.69

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Solution

The fourth proportional to 790.19, 1,182.85 and 515.69 is: 771.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.19 : 1,182.85 = 515.69 : x
  2. Step 2: Convert to fraction form
    790.19/1,182.85 = 515.69/x
  3. Step 3: Cross multiply
    790.19x = 1,182.85 × 515.69
  4. Step 4: Simplify right side
    790.19x = 609,976.71
  5. Step 5: Solve for x
    x = 609,976.71/790.19
  6. Step 6: Final answer
    x = 771.94

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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.