Home / 2,871.40-4,307.10-923.80

Finding the Fourth Proportional to 2,871.40, 4,307.10 and 923.80

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Solution

The fourth proportional to 2,871.40, 4,307.10 and 923.80 is: 1,385.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,871.40 : 4,307.10 = 923.80 : x
  2. Step 2: Convert to fraction form
    2,871.40/4,307.10 = 923.80/x
  3. Step 3: Cross multiply
    2,871.40x = 4,307.10 × 923.80
  4. Step 4: Simplify right side
    2,871.40x = 3,978,898.98
  5. Step 5: Solve for x
    x = 3,978,898.98/2,871.40
  6. Step 6: Final answer
    x = 1,385.70

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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.