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Finding the Fourth Proportional to 877.80, 1,211.38 and 504.72

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Solution

The fourth proportional to 877.80, 1,211.38 and 504.72 is: 696.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.80 : 1,211.38 = 504.72 : x
  2. Step 2: Convert to fraction form
    877.80/1,211.38 = 504.72/x
  3. Step 3: Cross multiply
    877.80x = 1,211.38 × 504.72
  4. Step 4: Simplify right side
    877.80x = 611,407.71
  5. Step 5: Solve for x
    x = 611,407.71/877.80
  6. Step 6: Final answer
    x = 696.52

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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.