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Finding the Fourth Proportional to 520,190, 717,862.20 and 281,726

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Solution

The fourth proportional to 520,190, 717,862.20 and 281,726 is: 388,781.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,190 : 717,862.20 = 281,726 : x
  2. Step 2: Convert to fraction form
    520,190/717,862.20 = 281,726/x
  3. Step 3: Cross multiply
    520,190x = 717,862.20 × 281,726
  4. Step 4: Simplify right side
    520,190x = 202,240,446,157.20
  5. Step 5: Solve for x
    x = 202,240,446,157.20/520,190
  6. Step 6: Final answer
    x = 388,781.88

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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.