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Finding the Fourth Proportional to 877.76, 1,316.83 and 261.51

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Solution

The fourth proportional to 877.76, 1,316.83 and 261.51 is: 392.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.76 : 1,316.83 = 261.51 : x
  2. Step 2: Convert to fraction form
    877.76/1,316.83 = 261.51/x
  3. Step 3: Cross multiply
    877.76x = 1,316.83 × 261.51
  4. Step 4: Simplify right side
    877.76x = 344,365.60
  5. Step 5: Solve for x
    x = 344,365.60/877.76
  6. Step 6: Final answer
    x = 392.32

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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.