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Finding the Fourth Proportional to 855.77, 1,288.66 and 613.98

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Solution

The fourth proportional to 855.77, 1,288.66 and 613.98 is: 924.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.77 : 1,288.66 = 613.98 : x
  2. Step 2: Convert to fraction form
    855.77/1,288.66 = 613.98/x
  3. Step 3: Cross multiply
    855.77x = 1,288.66 × 613.98
  4. Step 4: Simplify right side
    855.77x = 791,211.08
  5. Step 5: Solve for x
    x = 791,211.08/855.77
  6. Step 6: Final answer
    x = 924.57

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.