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Finding the Fourth Proportional to 776.68, 1,071.60 and 678.24

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Solution

The fourth proportional to 776.68, 1,071.60 and 678.24 is: 935.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.68 : 1,071.60 = 678.24 : x
  2. Step 2: Convert to fraction form
    776.68/1,071.60 = 678.24/x
  3. Step 3: Cross multiply
    776.68x = 1,071.60 × 678.24
  4. Step 4: Simplify right side
    776.68x = 726,801.98
  5. Step 5: Solve for x
    x = 726,801.98/776.68
  6. Step 6: Final answer
    x = 935.78

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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.