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Finding the Fourth Proportional to 1,355.76, 1,866.24 and 1,189.20

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Solution

The fourth proportional to 1,355.76, 1,866.24 and 1,189.20 is: 1,636.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.76 : 1,866.24 = 1,189.20 : x
  2. Step 2: Convert to fraction form
    1,355.76/1,866.24 = 1,189.20/x
  3. Step 3: Cross multiply
    1,355.76x = 1,866.24 × 1,189.20
  4. Step 4: Simplify right side
    1,355.76x = 2,219,332.61
  5. Step 5: Solve for x
    x = 2,219,332.61/1,355.76
  6. Step 6: Final answer
    x = 1,636.97

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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.