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Finding the Fourth Proportional to 856.02, 1,285.06 and 578.60

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Solution

The fourth proportional to 856.02, 1,285.06 and 578.60 is: 868.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.02 : 1,285.06 = 578.60 : x
  2. Step 2: Convert to fraction form
    856.02/1,285.06 = 578.60/x
  3. Step 3: Cross multiply
    856.02x = 1,285.06 × 578.60
  4. Step 4: Simplify right side
    856.02x = 743,535.72
  5. Step 5: Solve for x
    x = 743,535.72/856.02
  6. Step 6: Final answer
    x = 868.60

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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.