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Finding the Fourth Proportional to 631.21, 941.05 and 615.22

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Solution

The fourth proportional to 631.21, 941.05 and 615.22 is: 917.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    631.21 : 941.05 = 615.22 : x
  2. Step 2: Convert to fraction form
    631.21/941.05 = 615.22/x
  3. Step 3: Cross multiply
    631.21x = 941.05 × 615.22
  4. Step 4: Simplify right side
    631.21x = 578,952.78
  5. Step 5: Solve for x
    x = 578,952.78/631.21
  6. Step 6: Final answer
    x = 917.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.