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Finding the Fourth Proportional to 864.58, 1,192.96 and 491.47

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Solution

The fourth proportional to 864.58, 1,192.96 and 491.47 is: 678.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.58 : 1,192.96 = 491.47 : x
  2. Step 2: Convert to fraction form
    864.58/1,192.96 = 491.47/x
  3. Step 3: Cross multiply
    864.58x = 1,192.96 × 491.47
  4. Step 4: Simplify right side
    864.58x = 586,304.05
  5. Step 5: Solve for x
    x = 586,304.05/864.58
  6. Step 6: Final answer
    x = 678.14

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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.