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Finding the Fourth Proportional to 901.15, 1,352.15 and 407.90

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Solution

The fourth proportional to 901.15, 1,352.15 and 407.90 is: 612.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.15 : 1,352.15 = 407.90 : x
  2. Step 2: Convert to fraction form
    901.15/1,352.15 = 407.90/x
  3. Step 3: Cross multiply
    901.15x = 1,352.15 × 407.90
  4. Step 4: Simplify right side
    901.15x = 551,546.39
  5. Step 5: Solve for x
    x = 551,546.39/901.15
  6. Step 6: Final answer
    x = 612.05

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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.