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Finding the Fourth Proportional to 906.61, 1,356.67 and 785.29

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Solution

The fourth proportional to 906.61, 1,356.67 and 785.29 is: 1,175.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.61 : 1,356.67 = 785.29 : x
  2. Step 2: Convert to fraction form
    906.61/1,356.67 = 785.29/x
  3. Step 3: Cross multiply
    906.61x = 1,356.67 × 785.29
  4. Step 4: Simplify right side
    906.61x = 1,065,379.38
  5. Step 5: Solve for x
    x = 1,065,379.38/906.61
  6. Step 6: Final answer
    x = 1,175.12

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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.