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Finding the Fourth Proportional to 518,420.25, 715,419.95 and 279,956.25

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Solution

The fourth proportional to 518,420.25, 715,419.95 and 279,956.25 is: 386,339.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,420.25 : 715,419.95 = 279,956.25 : x
  2. Step 2: Convert to fraction form
    518,420.25/715,419.95 = 279,956.25/x
  3. Step 3: Cross multiply
    518,420.25x = 715,419.95 × 279,956.25
  4. Step 4: Simplify right side
    518,420.25x = 200,286,284,977.41
  5. Step 5: Solve for x
    x = 200,286,284,977.41/518,420.25
  6. Step 6: Final answer
    x = 386,339.63

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Similar ratio
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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.