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Finding the Fourth Proportional to 819.01, 1,129.98 and 469.63

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Solution

The fourth proportional to 819.01, 1,129.98 and 469.63 is: 647.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.01 : 1,129.98 = 469.63 : x
  2. Step 2: Convert to fraction form
    819.01/1,129.98 = 469.63/x
  3. Step 3: Cross multiply
    819.01x = 1,129.98 × 469.63
  4. Step 4: Simplify right side
    819.01x = 530,672.51
  5. Step 5: Solve for x
    x = 530,672.51/819.01
  6. Step 6: Final answer
    x = 647.94

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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.