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Finding the Fourth Proportional to 841.69, 1,263.03 and 431.20

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Solution

The fourth proportional to 841.69, 1,263.03 and 431.20 is: 647.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.69 : 1,263.03 = 431.20 : x
  2. Step 2: Convert to fraction form
    841.69/1,263.03 = 431.20/x
  3. Step 3: Cross multiply
    841.69x = 1,263.03 × 431.20
  4. Step 4: Simplify right side
    841.69x = 544,618.54
  5. Step 5: Solve for x
    x = 544,618.54/841.69
  6. Step 6: Final answer
    x = 647.05

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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.