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Finding the Fourth Proportional to 864.38, 1,192.86 and 491.34

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Solution

The fourth proportional to 864.38, 1,192.86 and 491.34 is: 678.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.38 : 1,192.86 = 491.34 : x
  2. Step 2: Convert to fraction form
    864.38/1,192.86 = 491.34/x
  3. Step 3: Cross multiply
    864.38x = 1,192.86 × 491.34
  4. Step 4: Simplify right side
    864.38x = 586,099.83
  5. Step 5: Solve for x
    x = 586,099.83/864.38
  6. Step 6: Final answer
    x = 678.06

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1.5x scale

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.