Home / 1,385.15-1,913.94-1,107.68

Finding the Fourth Proportional to 1,385.15, 1,913.94 and 1,107.68

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Solution

The fourth proportional to 1,385.15, 1,913.94 and 1,107.68 is: 1,530.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.15 : 1,913.94 = 1,107.68 : x
  2. Step 2: Convert to fraction form
    1,385.15/1,913.94 = 1,107.68/x
  3. Step 3: Cross multiply
    1,385.15x = 1,913.94 × 1,107.68
  4. Step 4: Simplify right side
    1,385.15x = 2,120,017.95
  5. Step 5: Solve for x
    x = 2,120,017.95/1,385.15
  6. Step 6: Final answer
    x = 1,530.53

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1.5x scale

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.