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Finding the Fourth Proportional to 910.69, 1,365.20 and 355.77

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Solution

The fourth proportional to 910.69, 1,365.20 and 355.77 is: 533.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.69 : 1,365.20 = 355.77 : x
  2. Step 2: Convert to fraction form
    910.69/1,365.20 = 355.77/x
  3. Step 3: Cross multiply
    910.69x = 1,365.20 × 355.77
  4. Step 4: Simplify right side
    910.69x = 485,697.20
  5. Step 5: Solve for x
    x = 485,697.20/910.69
  6. Step 6: Final answer
    x = 533.33

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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.