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Finding the Fourth Proportional to 877.81, 1,316.30 and 261.30

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Solution

The fourth proportional to 877.81, 1,316.30 and 261.30 is: 391.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.81 : 1,316.30 = 261.30 : x
  2. Step 2: Convert to fraction form
    877.81/1,316.30 = 261.30/x
  3. Step 3: Cross multiply
    877.81x = 1,316.30 × 261.30
  4. Step 4: Simplify right side
    877.81x = 343,946.89
  5. Step 5: Solve for x
    x = 343,946.89/877.81
  6. Step 6: Final answer
    x = 391.82

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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.