Home / 3,118.10-4,678.02-926.78

Finding the Fourth Proportional to 3,118.10, 4,678.02 and 926.78

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Solution

The fourth proportional to 3,118.10, 4,678.02 and 926.78 is: 1,390.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,118.10 : 4,678.02 = 926.78 : x
  2. Step 2: Convert to fraction form
    3,118.10/4,678.02 = 926.78/x
  3. Step 3: Cross multiply
    3,118.10x = 4,678.02 × 926.78
  4. Step 4: Simplify right side
    3,118.10x = 4,335,495.38
  5. Step 5: Solve for x
    x = 4,335,495.38/3,118.10
  6. Step 6: Final answer
    x = 1,390.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.