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Finding the Fourth Proportional to 1,038.56, 1,557.36 and 422.15

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Solution

The fourth proportional to 1,038.56, 1,557.36 and 422.15 is: 633.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.56 : 1,557.36 = 422.15 : x
  2. Step 2: Convert to fraction form
    1,038.56/1,557.36 = 422.15/x
  3. Step 3: Cross multiply
    1,038.56x = 1,557.36 × 422.15
  4. Step 4: Simplify right side
    1,038.56x = 657,431.74
  5. Step 5: Solve for x
    x = 657,431.74/1,038.56
  6. Step 6: Final answer
    x = 633.03

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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.