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Finding the Fourth Proportional to 803.19, 1,205.10 and 437.55

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Solution

The fourth proportional to 803.19, 1,205.10 and 437.55 is: 656.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.19 : 1,205.10 = 437.55 : x
  2. Step 2: Convert to fraction form
    803.19/1,205.10 = 437.55/x
  3. Step 3: Cross multiply
    803.19x = 1,205.10 × 437.55
  4. Step 4: Simplify right side
    803.19x = 527,291.51
  5. Step 5: Solve for x
    x = 527,291.51/803.19
  6. Step 6: Final answer
    x = 656.50

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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.