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Finding the Fourth Proportional to 803.04, 1,205.55 and 478.68

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Solution

The fourth proportional to 803.04, 1,205.55 and 478.68 is: 718.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.04 : 1,205.55 = 478.68 : x
  2. Step 2: Convert to fraction form
    803.04/1,205.55 = 478.68/x
  3. Step 3: Cross multiply
    803.04x = 1,205.55 × 478.68
  4. Step 4: Simplify right side
    803.04x = 577,072.67
  5. Step 5: Solve for x
    x = 577,072.67/803.04
  6. Step 6: Final answer
    x = 718.61

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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.