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Finding the Fourth Proportional to 977.76, 1,339.43 and 940.86

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Solution

The fourth proportional to 977.76, 1,339.43 and 940.86 is: 1,288.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    977.76 : 1,339.43 = 940.86 : x
  2. Step 2: Convert to fraction form
    977.76/1,339.43 = 940.86/x
  3. Step 3: Cross multiply
    977.76x = 1,339.43 × 940.86
  4. Step 4: Simplify right side
    977.76x = 1,260,211.41
  5. Step 5: Solve for x
    x = 1,260,211.41/977.76
  6. Step 6: Final answer
    x = 1,288.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.