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Finding the Fourth Proportional to 390,272.60, 585,117.30 and 212,979.80

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Solution

The fourth proportional to 390,272.60, 585,117.30 and 212,979.80 is: 319,310.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,272.60 : 585,117.30 = 212,979.80 : x
  2. Step 2: Convert to fraction form
    390,272.60/585,117.30 = 212,979.80/x
  3. Step 3: Cross multiply
    390,272.60x = 585,117.30 × 212,979.80
  4. Step 4: Simplify right side
    390,272.60x = 124,618,165,530.54
  5. Step 5: Solve for x
    x = 124,618,165,530.54/390,272.60
  6. Step 6: Final answer
    x = 319,310.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.