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Finding the Fourth Proportional to 940.80, 1,295.55 and 678.36

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Solution

The fourth proportional to 940.80, 1,295.55 and 678.36 is: 934.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.80 : 1,295.55 = 678.36 : x
  2. Step 2: Convert to fraction form
    940.80/1,295.55 = 678.36/x
  3. Step 3: Cross multiply
    940.80x = 1,295.55 × 678.36
  4. Step 4: Simplify right side
    940.80x = 878,849.30
  5. Step 5: Solve for x
    x = 878,849.30/940.80
  6. Step 6: Final answer
    x = 934.15

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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.