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Finding the Fourth Proportional to 389,984.90, 585,062.40 and 221,585.90

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Solution

The fourth proportional to 389,984.90, 585,062.40 and 221,585.90 is: 332,427.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,984.90 : 585,062.40 = 221,585.90 : x
  2. Step 2: Convert to fraction form
    389,984.90/585,062.40 = 221,585.90/x
  3. Step 3: Cross multiply
    389,984.90x = 585,062.40 × 221,585.90
  4. Step 4: Simplify right side
    389,984.90x = 129,641,578,460.16
  5. Step 5: Solve for x
    x = 129,641,578,460.16/389,984.90
  6. Step 6: Final answer
    x = 332,427.17

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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.