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Finding the Fourth Proportional to 877.79, 1,211.32 and 479.45

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Solution

The fourth proportional to 877.79, 1,211.32 and 479.45 is: 661.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.79 : 1,211.32 = 479.45 : x
  2. Step 2: Convert to fraction form
    877.79/1,211.32 = 479.45/x
  3. Step 3: Cross multiply
    877.79x = 1,211.32 × 479.45
  4. Step 4: Simplify right side
    877.79x = 580,771.00
  5. Step 5: Solve for x
    x = 580,771.00/877.79
  6. Step 6: Final answer
    x = 661.63

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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.