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Finding the Fourth Proportional to 864.60, 1,192.48 and 561.84

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Solution

The fourth proportional to 864.60, 1,192.48 and 561.84 is: 774.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.60 : 1,192.48 = 561.84 : x
  2. Step 2: Convert to fraction form
    864.60/1,192.48 = 561.84/x
  3. Step 3: Cross multiply
    864.60x = 1,192.48 × 561.84
  4. Step 4: Simplify right side
    864.60x = 669,982.96
  5. Step 5: Solve for x
    x = 669,982.96/864.60
  6. Step 6: Final answer
    x = 774.91

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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.