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Finding the Fourth Proportional to 611.12, 916.69 and 148.90

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Solution

The fourth proportional to 611.12, 916.69 and 148.90 is: 223.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.12 : 916.69 = 148.90 : x
  2. Step 2: Convert to fraction form
    611.12/916.69 = 148.90/x
  3. Step 3: Cross multiply
    611.12x = 916.69 × 148.90
  4. Step 4: Simplify right side
    611.12x = 136,492.98
  5. Step 5: Solve for x
    x = 136,492.98/611.12
  6. Step 6: Final answer
    x = 223.35

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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.