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Finding the Fourth Proportional to 222.61, 307.47 and 157.40

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Solution

The fourth proportional to 222.61, 307.47 and 157.40 is: 217.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.61 : 307.47 = 157.40 : x
  2. Step 2: Convert to fraction form
    222.61/307.47 = 157.40/x
  3. Step 3: Cross multiply
    222.61x = 307.47 × 157.40
  4. Step 4: Simplify right side
    222.61x = 48,397.14
  5. Step 5: Solve for x
    x = 48,397.14/222.61
  6. Step 6: Final answer
    x = 217.41

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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.