Home / 1,035.12-1,428.48-615.78

Finding the Fourth Proportional to 1,035.12, 1,428.48 and 615.78

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Solution

The fourth proportional to 1,035.12, 1,428.48 and 615.78 is: 849.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,035.12 : 1,428.48 = 615.78 : x
  2. Step 2: Convert to fraction form
    1,035.12/1,428.48 = 615.78/x
  3. Step 3: Cross multiply
    1,035.12x = 1,428.48 × 615.78
  4. Step 4: Simplify right side
    1,035.12x = 879,629.41
  5. Step 5: Solve for x
    x = 879,629.41/1,035.12
  6. Step 6: Final answer
    x = 849.78

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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.