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Finding the Fourth Proportional to 946.72, 1,306.12 and 666.44

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Solution

The fourth proportional to 946.72, 1,306.12 and 666.44 is: 919.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.72 : 1,306.12 = 666.44 : x
  2. Step 2: Convert to fraction form
    946.72/1,306.12 = 666.44/x
  3. Step 3: Cross multiply
    946.72x = 1,306.12 × 666.44
  4. Step 4: Simplify right side
    946.72x = 870,450.61
  5. Step 5: Solve for x
    x = 870,450.61/946.72
  6. Step 6: Final answer
    x = 919.44

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1.5x scale

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.