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Finding the Fourth Proportional to 972.76, 1,451.28 and 856.12

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Solution

The fourth proportional to 972.76, 1,451.28 and 856.12 is: 1,277.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.76 : 1,451.28 = 856.12 : x
  2. Step 2: Convert to fraction form
    972.76/1,451.28 = 856.12/x
  3. Step 3: Cross multiply
    972.76x = 1,451.28 × 856.12
  4. Step 4: Simplify right side
    972.76x = 1,242,469.83
  5. Step 5: Solve for x
    x = 1,242,469.83/972.76
  6. Step 6: Final answer
    x = 1,277.26

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.