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Finding the Fourth Proportional to 864.07, 1,192.50 and 665.10

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Solution

The fourth proportional to 864.07, 1,192.50 and 665.10 is: 917.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.07 : 1,192.50 = 665.10 : x
  2. Step 2: Convert to fraction form
    864.07/1,192.50 = 665.10/x
  3. Step 3: Cross multiply
    864.07x = 1,192.50 × 665.10
  4. Step 4: Simplify right side
    864.07x = 793,131.75
  5. Step 5: Solve for x
    x = 793,131.75/864.07
  6. Step 6: Final answer
    x = 917.90

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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.