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Finding the Fourth Proportional to 1,167.48, 1,611.11 and 643.50

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Solution

The fourth proportional to 1,167.48, 1,611.11 and 643.50 is: 888.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,167.48 : 1,611.11 = 643.50 : x
  2. Step 2: Convert to fraction form
    1,167.48/1,611.11 = 643.50/x
  3. Step 3: Cross multiply
    1,167.48x = 1,611.11 × 643.50
  4. Step 4: Simplify right side
    1,167.48x = 1,036,750.89
  5. Step 5: Solve for x
    x = 1,036,750.89/1,167.48
  6. Step 6: Final answer
    x = 888.02

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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.