Home / 2,869.40-4,304.70-921.80

Finding the Fourth Proportional to 2,869.40, 4,304.70 and 921.80

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Solution

The fourth proportional to 2,869.40, 4,304.70 and 921.80 is: 1,382.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,869.40 : 4,304.70 = 921.80 : x
  2. Step 2: Convert to fraction form
    2,869.40/4,304.70 = 921.80/x
  3. Step 3: Cross multiply
    2,869.40x = 4,304.70 × 921.80
  4. Step 4: Simplify right side
    2,869.40x = 3,968,072.46
  5. Step 5: Solve for x
    x = 3,968,072.46/2,869.40
  6. Step 6: Final answer
    x = 1,382.89

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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.