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Finding the Fourth Proportional to 1,077.18, 1,615.95 and 427.96

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Solution

The fourth proportional to 1,077.18, 1,615.95 and 427.96 is: 642.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.18 : 1,615.95 = 427.96 : x
  2. Step 2: Convert to fraction form
    1,077.18/1,615.95 = 427.96/x
  3. Step 3: Cross multiply
    1,077.18x = 1,615.95 × 427.96
  4. Step 4: Simplify right side
    1,077.18x = 691,561.96
  5. Step 5: Solve for x
    x = 691,561.96/1,077.18
  6. Step 6: Final answer
    x = 642.01

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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.