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Finding the Fourth Proportional to 903.15, 1,245.98 and 667.64

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Solution

The fourth proportional to 903.15, 1,245.98 and 667.64 is: 921.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.15 : 1,245.98 = 667.64 : x
  2. Step 2: Convert to fraction form
    903.15/1,245.98 = 667.64/x
  3. Step 3: Cross multiply
    903.15x = 1,245.98 × 667.64
  4. Step 4: Simplify right side
    903.15x = 831,870.87
  5. Step 5: Solve for x
    x = 831,870.87/903.15
  6. Step 6: Final answer
    x = 921.08

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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.