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Finding the Fourth Proportional to 1,071.96, 1,605.60 and 638.16

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Solution

The fourth proportional to 1,071.96, 1,605.60 and 638.16 is: 955.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.96 : 1,605.60 = 638.16 : x
  2. Step 2: Convert to fraction form
    1,071.96/1,605.60 = 638.16/x
  3. Step 3: Cross multiply
    1,071.96x = 1,605.60 × 638.16
  4. Step 4: Simplify right side
    1,071.96x = 1,024,629.70
  5. Step 5: Solve for x
    x = 1,024,629.70/1,071.96
  6. Step 6: Final answer
    x = 955.85

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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.