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Finding the Fourth Proportional to 617,139.90, 851,310.21 and 358,987.79

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Solution

The fourth proportional to 617,139.90, 851,310.21 and 358,987.79 is: 495,203.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    617,139.90 : 851,310.21 = 358,987.79 : x
  2. Step 2: Convert to fraction form
    617,139.90/851,310.21 = 358,987.79/x
  3. Step 3: Cross multiply
    617,139.90x = 851,310.21 × 358,987.79
  4. Step 4: Simplify right side
    617,139.90x = 305,609,966,635.79
  5. Step 5: Solve for x
    x = 305,609,966,635.79/617,139.90
  6. Step 6: Final answer
    x = 495,203.71

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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.