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Finding the Fourth Proportional to 784.11, 1,081.18 and 500.15

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Solution

The fourth proportional to 784.11, 1,081.18 and 500.15 is: 689.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.11 : 1,081.18 = 500.15 : x
  2. Step 2: Convert to fraction form
    784.11/1,081.18 = 500.15/x
  3. Step 3: Cross multiply
    784.11x = 1,081.18 × 500.15
  4. Step 4: Simplify right side
    784.11x = 540,751.35
  5. Step 5: Solve for x
    x = 540,751.35/784.11
  6. Step 6: Final answer
    x = 689.64

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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.