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Finding the Fourth Proportional to 856.51, 1,285.07 and 271.60

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Solution

The fourth proportional to 856.51, 1,285.07 and 271.60 is: 407.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.51 : 1,285.07 = 271.60 : x
  2. Step 2: Convert to fraction form
    856.51/1,285.07 = 271.60/x
  3. Step 3: Cross multiply
    856.51x = 1,285.07 × 271.60
  4. Step 4: Simplify right side
    856.51x = 349,025.01
  5. Step 5: Solve for x
    x = 349,025.01/856.51
  6. Step 6: Final answer
    x = 407.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.