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Finding the Fourth Proportional to 765.77, 1,055.97 and 655.61

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Solution

The fourth proportional to 765.77, 1,055.97 and 655.61 is: 904.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.77 : 1,055.97 = 655.61 : x
  2. Step 2: Convert to fraction form
    765.77/1,055.97 = 655.61/x
  3. Step 3: Cross multiply
    765.77x = 1,055.97 × 655.61
  4. Step 4: Simplify right side
    765.77x = 692,299.21
  5. Step 5: Solve for x
    x = 692,299.21/765.77
  6. Step 6: Final answer
    x = 904.06

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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.