Home / 1,515.30-2,090.52-917.91

Finding the Fourth Proportional to 1,515.30, 2,090.52 and 917.91

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Solution

The fourth proportional to 1,515.30, 2,090.52 and 917.91 is: 1,266.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,515.30 : 2,090.52 = 917.91 : x
  2. Step 2: Convert to fraction form
    1,515.30/2,090.52 = 917.91/x
  3. Step 3: Cross multiply
    1,515.30x = 2,090.52 × 917.91
  4. Step 4: Simplify right side
    1,515.30x = 1,918,909.21
  5. Step 5: Solve for x
    x = 1,918,909.21/1,515.30
  6. Step 6: Final answer
    x = 1,266.36

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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.