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Finding the Fourth Proportional to 905.04, 1,355.64 and 612.72

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Solution

The fourth proportional to 905.04, 1,355.64 and 612.72 is: 917.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.04 : 1,355.64 = 612.72 : x
  2. Step 2: Convert to fraction form
    905.04/1,355.64 = 612.72/x
  3. Step 3: Cross multiply
    905.04x = 1,355.64 × 612.72
  4. Step 4: Simplify right side
    905.04x = 830,627.74
  5. Step 5: Solve for x
    x = 830,627.74/905.04
  6. Step 6: Final answer
    x = 917.78

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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.