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Finding the Fourth Proportional to 612.77, 916.72 and 505.85

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Solution

The fourth proportional to 612.77, 916.72 and 505.85 is: 756.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.77 : 916.72 = 505.85 : x
  2. Step 2: Convert to fraction form
    612.77/916.72 = 505.85/x
  3. Step 3: Cross multiply
    612.77x = 916.72 × 505.85
  4. Step 4: Simplify right side
    612.77x = 463,716.96
  5. Step 5: Solve for x
    x = 463,716.96/612.77
  6. Step 6: Final answer
    x = 756.76

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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.