Home / 2,931.80-4,398.30-1,289.12

Finding the Fourth Proportional to 2,931.80, 4,398.30 and 1,289.12

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Solution

The fourth proportional to 2,931.80, 4,398.30 and 1,289.12 is: 1,933.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,931.80 : 4,398.30 = 1,289.12 : x
  2. Step 2: Convert to fraction form
    2,931.80/4,398.30 = 1,289.12/x
  3. Step 3: Cross multiply
    2,931.80x = 4,398.30 × 1,289.12
  4. Step 4: Simplify right side
    2,931.80x = 5,669,914.50
  5. Step 5: Solve for x
    x = 5,669,914.50/2,931.80
  6. Step 6: Final answer
    x = 1,933.94

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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.