Home / 1,115.12-1,673.76-538.40

Finding the Fourth Proportional to 1,115.12, 1,673.76 and 538.40

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Solution

The fourth proportional to 1,115.12, 1,673.76 and 538.40 is: 808.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.12 : 1,673.76 = 538.40 : x
  2. Step 2: Convert to fraction form
    1,115.12/1,673.76 = 538.40/x
  3. Step 3: Cross multiply
    1,115.12x = 1,673.76 × 538.40
  4. Step 4: Simplify right side
    1,115.12x = 901,144.02
  5. Step 5: Solve for x
    x = 901,144.02/1,115.12
  6. Step 6: Final answer
    x = 808.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.