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Finding the Fourth Proportional to 856.32, 1,291.92 and 761.28

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Solution

The fourth proportional to 856.32, 1,291.92 and 761.28 is: 1,148.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.32 : 1,291.92 = 761.28 : x
  2. Step 2: Convert to fraction form
    856.32/1,291.92 = 761.28/x
  3. Step 3: Cross multiply
    856.32x = 1,291.92 × 761.28
  4. Step 4: Simplify right side
    856.32x = 983,512.86
  5. Step 5: Solve for x
    x = 983,512.86/856.32
  6. Step 6: Final answer
    x = 1,148.53

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.