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Finding the Fourth Proportional to 931.74, 1,285.78 and 512.10

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Solution

The fourth proportional to 931.74, 1,285.78 and 512.10 is: 706.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.74 : 1,285.78 = 512.10 : x
  2. Step 2: Convert to fraction form
    931.74/1,285.78 = 512.10/x
  3. Step 3: Cross multiply
    931.74x = 1,285.78 × 512.10
  4. Step 4: Simplify right side
    931.74x = 658,447.94
  5. Step 5: Solve for x
    x = 658,447.94/931.74
  6. Step 6: Final answer
    x = 706.69

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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.