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Finding the Fourth Proportional to 783.46, 1,082.06 and 678.38

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Solution

The fourth proportional to 783.46, 1,082.06 and 678.38 is: 936.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.46 : 1,082.06 = 678.38 : x
  2. Step 2: Convert to fraction form
    783.46/1,082.06 = 678.38/x
  3. Step 3: Cross multiply
    783.46x = 1,082.06 × 678.38
  4. Step 4: Simplify right side
    783.46x = 734,044.15
  5. Step 5: Solve for x
    x = 734,044.15/783.46
  6. Step 6: Final answer
    x = 936.93

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Double scale
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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.