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Finding the Fourth Proportional to 864.06, 1,186 and 790.24

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Solution

The fourth proportional to 864.06, 1,186 and 790.24 is: 1,084.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.06 : 1,186 = 790.24 : x
  2. Step 2: Convert to fraction form
    864.06/1,186 = 790.24/x
  3. Step 3: Cross multiply
    864.06x = 1,186 × 790.24
  4. Step 4: Simplify right side
    864.06x = 937,224.64
  5. Step 5: Solve for x
    x = 937,224.64/864.06
  6. Step 6: Final answer
    x = 1,084.68

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.