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Finding the Fourth Proportional to 639,491.10, 960,921.45 and 355,407.90

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Solution

The fourth proportional to 639,491.10, 960,921.45 and 355,407.90 is: 534,048.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,491.10 : 960,921.45 = 355,407.90 : x
  2. Step 2: Convert to fraction form
    639,491.10/960,921.45 = 355,407.90/x
  3. Step 3: Cross multiply
    639,491.10x = 960,921.45 × 355,407.90
  4. Step 4: Simplify right side
    639,491.10x = 341,519,074,609.46
  5. Step 5: Solve for x
    x = 341,519,074,609.46/639,491.10
  6. Step 6: Final answer
    x = 534,048.21

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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.