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Finding the Fourth Proportional to 923.80, 1,272.08 and 661.36

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Solution

The fourth proportional to 923.80, 1,272.08 and 661.36 is: 910.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.80 : 1,272.08 = 661.36 : x
  2. Step 2: Convert to fraction form
    923.80/1,272.08 = 661.36/x
  3. Step 3: Cross multiply
    923.80x = 1,272.08 × 661.36
  4. Step 4: Simplify right side
    923.80x = 841,302.83
  5. Step 5: Solve for x
    x = 841,302.83/923.80
  6. Step 6: Final answer
    x = 910.70

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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.