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Finding the Fourth Proportional to 818.58, 1,129.61 and 469.20

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Solution

The fourth proportional to 818.58, 1,129.61 and 469.20 is: 647.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.58 : 1,129.61 = 469.20 : x
  2. Step 2: Convert to fraction form
    818.58/1,129.61 = 469.20/x
  3. Step 3: Cross multiply
    818.58x = 1,129.61 × 469.20
  4. Step 4: Simplify right side
    818.58x = 530,013.01
  5. Step 5: Solve for x
    x = 530,013.01/818.58
  6. Step 6: Final answer
    x = 647.48

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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.