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Finding the Fourth Proportional to 1,054.32, 1,455.26 and 661.33

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Solution

The fourth proportional to 1,054.32, 1,455.26 and 661.33 is: 912.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,054.32 : 1,455.26 = 661.33 : x
  2. Step 2: Convert to fraction form
    1,054.32/1,455.26 = 661.33/x
  3. Step 3: Cross multiply
    1,054.32x = 1,455.26 × 661.33
  4. Step 4: Simplify right side
    1,054.32x = 962,407.10
  5. Step 5: Solve for x
    x = 962,407.10/1,054.32
  6. Step 6: Final answer
    x = 912.82

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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.