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Finding the Fourth Proportional to 1,438, 2,155.94 and 615.76

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Solution

The fourth proportional to 1,438, 2,155.94 and 615.76 is: 923.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,438 : 2,155.94 = 615.76 : x
  2. Step 2: Convert to fraction form
    1,438/2,155.94 = 615.76/x
  3. Step 3: Cross multiply
    1,438x = 2,155.94 × 615.76
  4. Step 4: Simplify right side
    1,438x = 1,327,541.61
  5. Step 5: Solve for x
    x = 1,327,541.61/1,438
  6. Step 6: Final answer
    x = 923.19

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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.