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Finding the Fourth Proportional to 1,035, 1,428.51 and 615.51

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Solution

The fourth proportional to 1,035, 1,428.51 and 615.51 is: 849.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,035 : 1,428.51 = 615.51 : x
  2. Step 2: Convert to fraction form
    1,035/1,428.51 = 615.51/x
  3. Step 3: Cross multiply
    1,035x = 1,428.51 × 615.51
  4. Step 4: Simplify right side
    1,035x = 879,262.19
  5. Step 5: Solve for x
    x = 879,262.19/1,035
  6. Step 6: Final answer
    x = 849.53

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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.