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Finding the Fourth Proportional to 1,109.15, 1,530.38 and 643.13

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Solution

The fourth proportional to 1,109.15, 1,530.38 and 643.13 is: 887.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.15 : 1,530.38 = 643.13 : x
  2. Step 2: Convert to fraction form
    1,109.15/1,530.38 = 643.13/x
  3. Step 3: Cross multiply
    1,109.15x = 1,530.38 × 643.13
  4. Step 4: Simplify right side
    1,109.15x = 984,222.42
  5. Step 5: Solve for x
    x = 984,222.42/1,109.15
  6. Step 6: Final answer
    x = 887.37

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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.