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Finding the Fourth Proportional to 785.12, 1,177.93 and 612.38

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Solution

The fourth proportional to 785.12, 1,177.93 and 612.38 is: 918.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.12 : 1,177.93 = 612.38 : x
  2. Step 2: Convert to fraction form
    785.12/1,177.93 = 612.38/x
  3. Step 3: Cross multiply
    785.12x = 1,177.93 × 612.38
  4. Step 4: Simplify right side
    785.12x = 721,334.41
  5. Step 5: Solve for x
    x = 721,334.41/785.12
  6. Step 6: Final answer
    x = 918.76

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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.