Home / 1,110.47-1,673.21-919.78

Finding the Fourth Proportional to 1,110.47, 1,673.21 and 919.78

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Solution

The fourth proportional to 1,110.47, 1,673.21 and 919.78 is: 1,385.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,110.47 : 1,673.21 = 919.78 : x
  2. Step 2: Convert to fraction form
    1,110.47/1,673.21 = 919.78/x
  3. Step 3: Cross multiply
    1,110.47x = 1,673.21 × 919.78
  4. Step 4: Simplify right side
    1,110.47x = 1,538,983.21
  5. Step 5: Solve for x
    x = 1,538,983.21/1,110.47
  6. Step 6: Final answer
    x = 1,385.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.