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Finding the Fourth Proportional to 784.91, 1,083.22 and 505.15

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Solution

The fourth proportional to 784.91, 1,083.22 and 505.15 is: 697.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.91 : 1,083.22 = 505.15 : x
  2. Step 2: Convert to fraction form
    784.91/1,083.22 = 505.15/x
  3. Step 3: Cross multiply
    784.91x = 1,083.22 × 505.15
  4. Step 4: Simplify right side
    784.91x = 547,193.55
  5. Step 5: Solve for x
    x = 547,193.55/784.91
  6. Step 6: Final answer
    x = 697.14

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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.