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Finding the Fourth Proportional to 390,488.88, 585,585.48 and 212,899.22

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Solution

The fourth proportional to 390,488.88, 585,585.48 and 212,899.22 is: 319,268.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,488.88 : 585,585.48 = 212,899.22 : x
  2. Step 2: Convert to fraction form
    390,488.88/585,585.48 = 212,899.22/x
  3. Step 3: Cross multiply
    390,488.88x = 585,585.48 × 212,899.22
  4. Step 4: Simplify right side
    390,488.88x = 124,670,691,935.33
  5. Step 5: Solve for x
    x = 124,670,691,935.33/390,488.88
  6. Step 6: Final answer
    x = 319,268.23

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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.