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Finding the Fourth Proportional to 1,171.54, 1,616.79 and 647.56

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Solution

The fourth proportional to 1,171.54, 1,616.79 and 647.56 is: 893.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.54 : 1,616.79 = 647.56 : x
  2. Step 2: Convert to fraction form
    1,171.54/1,616.79 = 647.56/x
  3. Step 3: Cross multiply
    1,171.54x = 1,616.79 × 647.56
  4. Step 4: Simplify right side
    1,171.54x = 1,046,968.53
  5. Step 5: Solve for x
    x = 1,046,968.53/1,171.54
  6. Step 6: Final answer
    x = 893.67

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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.