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Finding the Fourth Proportional to 877.69, 1,211.20 and 479.36

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Solution

The fourth proportional to 877.69, 1,211.20 and 479.36 is: 661.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.69 : 1,211.20 = 479.36 : x
  2. Step 2: Convert to fraction form
    877.69/1,211.20 = 479.36/x
  3. Step 3: Cross multiply
    877.69x = 1,211.20 × 479.36
  4. Step 4: Simplify right side
    877.69x = 580,600.83
  5. Step 5: Solve for x
    x = 580,600.83/877.69
  6. Step 6: Final answer
    x = 661.51

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1.5x scale

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.