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Finding the Fourth Proportional to 777.83, 1,166.36 and 315.21

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Solution

The fourth proportional to 777.83, 1,166.36 and 315.21 is: 472.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.83 : 1,166.36 = 315.21 : x
  2. Step 2: Convert to fraction form
    777.83/1,166.36 = 315.21/x
  3. Step 3: Cross multiply
    777.83x = 1,166.36 × 315.21
  4. Step 4: Simplify right side
    777.83x = 367,646.76
  5. Step 5: Solve for x
    x = 367,646.76/777.83
  6. Step 6: Final answer
    x = 472.66

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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.