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Finding the Fourth Proportional to 1,053.80, 1,578 and 642.32

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Solution

The fourth proportional to 1,053.80, 1,578 and 642.32 is: 961.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,053.80 : 1,578 = 642.32 : x
  2. Step 2: Convert to fraction form
    1,053.80/1,578 = 642.32/x
  3. Step 3: Cross multiply
    1,053.80x = 1,578 × 642.32
  4. Step 4: Simplify right side
    1,053.80x = 1,013,580.96
  5. Step 5: Solve for x
    x = 1,013,580.96/1,053.80
  6. Step 6: Final answer
    x = 961.83

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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.