Home / 1,515.13-2,090.57-885.47

Finding the Fourth Proportional to 1,515.13, 2,090.57 and 885.47

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Solution

The fourth proportional to 1,515.13, 2,090.57 and 885.47 is: 1,221.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515.13 : 2,090.57 = 885.47 : x
  2. Step 2: Convert to fraction form
    1,515.13/2,090.57 = 885.47/x
  3. Step 3: Cross multiply
    1,515.13x = 2,090.57 × 885.47
  4. Step 4: Simplify right side
    1,515.13x = 1,851,122.14
  5. Step 5: Solve for x
    x = 1,851,122.14/1,515.13
  6. Step 6: Final answer
    x = 1,221.76

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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.