Home / 1,316.28-1,974.65-438.90

Finding the Fourth Proportional to 1,316.28, 1,974.65 and 438.90

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Solution

The fourth proportional to 1,316.28, 1,974.65 and 438.90 is: 658.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.28 : 1,974.65 = 438.90 : x
  2. Step 2: Convert to fraction form
    1,316.28/1,974.65 = 438.90/x
  3. Step 3: Cross multiply
    1,316.28x = 1,974.65 × 438.90
  4. Step 4: Simplify right side
    1,316.28x = 866,671.69
  5. Step 5: Solve for x
    x = 866,671.69/1,316.28
  6. Step 6: Final answer
    x = 658.43

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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.