Home / 1,520.11-2,097.64-890.55

Finding the Fourth Proportional to 1,520.11, 2,097.64 and 890.55

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Solution

The fourth proportional to 1,520.11, 2,097.64 and 890.55 is: 1,228.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,520.11 : 2,097.64 = 890.55 : x
  2. Step 2: Convert to fraction form
    1,520.11/2,097.64 = 890.55/x
  3. Step 3: Cross multiply
    1,520.11x = 2,097.64 × 890.55
  4. Step 4: Simplify right side
    1,520.11x = 1,868,053.30
  5. Step 5: Solve for x
    x = 1,868,053.30/1,520.11
  6. Step 6: Final answer
    x = 1,228.89

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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.