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Finding the Fourth Proportional to 1,053.72, 1,578.93 and 642.75

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Solution

The fourth proportional to 1,053.72, 1,578.93 and 642.75 is: 963.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,053.72 : 1,578.93 = 642.75 : x
  2. Step 2: Convert to fraction form
    1,053.72/1,578.93 = 642.75/x
  3. Step 3: Cross multiply
    1,053.72x = 1,578.93 × 642.75
  4. Step 4: Simplify right side
    1,053.72x = 1,014,857.26
  5. Step 5: Solve for x
    x = 1,014,857.26/1,053.72
  6. Step 6: Final answer
    x = 963.12

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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.