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Finding the Fourth Proportional to 864.09, 1,192.18 and 780.93

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Solution

The fourth proportional to 864.09, 1,192.18 and 780.93 is: 1,077.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.09 : 1,192.18 = 780.93 : x
  2. Step 2: Convert to fraction form
    864.09/1,192.18 = 780.93/x
  3. Step 3: Cross multiply
    864.09x = 1,192.18 × 780.93
  4. Step 4: Simplify right side
    864.09x = 931,009.13
  5. Step 5: Solve for x
    x = 931,009.13/864.09
  6. Step 6: Final answer
    x = 1,077.44

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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.