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Finding the Fourth Proportional to 641,143.90, 884,701.48 and 369,300.21

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Solution

The fourth proportional to 641,143.90, 884,701.48 and 369,300.21 is: 509,589.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,143.90 : 884,701.48 = 369,300.21 : x
  2. Step 2: Convert to fraction form
    641,143.90/884,701.48 = 369,300.21/x
  3. Step 3: Cross multiply
    641,143.90x = 884,701.48 × 369,300.21
  4. Step 4: Simplify right side
    641,143.90x = 326,720,442,351.31
  5. Step 5: Solve for x
    x = 326,720,442,351.31/641,143.90
  6. Step 6: Final answer
    x = 509,589.88

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Double scale
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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.