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Finding the Fourth Proportional to 877.55, 1,316.30 and 261.66

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Solution

The fourth proportional to 877.55, 1,316.30 and 261.66 is: 392.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.55 : 1,316.30 = 261.66 : x
  2. Step 2: Convert to fraction form
    877.55/1,316.30 = 261.66/x
  3. Step 3: Cross multiply
    877.55x = 1,316.30 × 261.66
  4. Step 4: Simplify right side
    877.55x = 344,421.75
  5. Step 5: Solve for x
    x = 344,421.75/877.55
  6. Step 6: Final answer
    x = 392.48

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1.5x scale

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.