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Finding the Fourth Proportional to 930.24, 1,284.15 and 681.57

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Solution

The fourth proportional to 930.24, 1,284.15 and 681.57 is: 940.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.24 : 1,284.15 = 681.57 : x
  2. Step 2: Convert to fraction form
    930.24/1,284.15 = 681.57/x
  3. Step 3: Cross multiply
    930.24x = 1,284.15 × 681.57
  4. Step 4: Simplify right side
    930.24x = 875,238.12
  5. Step 5: Solve for x
    x = 875,238.12/930.24
  6. Step 6: Final answer
    x = 940.87

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1.5x scale

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.