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Finding the Fourth Proportional to 921.51, 1,272.29 and 711.32

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Solution

The fourth proportional to 921.51, 1,272.29 and 711.32 is: 982.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.51 : 1,272.29 = 711.32 : x
  2. Step 2: Convert to fraction form
    921.51/1,272.29 = 711.32/x
  3. Step 3: Cross multiply
    921.51x = 1,272.29 × 711.32
  4. Step 4: Simplify right side
    921.51x = 905,005.32
  5. Step 5: Solve for x
    x = 905,005.32/921.51
  6. Step 6: Final answer
    x = 982.09

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Double scale
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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.