Home / 1,385.25-1,911.85-913.07

Finding the Fourth Proportional to 1,385.25, 1,911.85 and 913.07

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Solution

The fourth proportional to 1,385.25, 1,911.85 and 913.07 is: 1,260.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.25 : 1,911.85 = 913.07 : x
  2. Step 2: Convert to fraction form
    1,385.25/1,911.85 = 913.07/x
  3. Step 3: Cross multiply
    1,385.25x = 1,911.85 × 913.07
  4. Step 4: Simplify right side
    1,385.25x = 1,745,652.88
  5. Step 5: Solve for x
    x = 1,745,652.88/1,385.25
  6. Step 6: Final answer
    x = 1,260.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.