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Finding the Fourth Proportional to 923.69, 1,272.98 and 661.25

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Solution

The fourth proportional to 923.69, 1,272.98 and 661.25 is: 911.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.69 : 1,272.98 = 661.25 : x
  2. Step 2: Convert to fraction form
    923.69/1,272.98 = 661.25/x
  3. Step 3: Cross multiply
    923.69x = 1,272.98 × 661.25
  4. Step 4: Simplify right side
    923.69x = 841,762.86
  5. Step 5: Solve for x
    x = 841,762.86/923.69
  6. Step 6: Final answer
    x = 911.30

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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.