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Finding the Fourth Proportional to 856.61, 1,285.31 and 417.62

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Solution

The fourth proportional to 856.61, 1,285.31 and 417.62 is: 626.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.61 : 1,285.31 = 417.62 : x
  2. Step 2: Convert to fraction form
    856.61/1,285.31 = 417.62/x
  3. Step 3: Cross multiply
    856.61x = 1,285.31 × 417.62
  4. Step 4: Simplify right side
    856.61x = 536,771.16
  5. Step 5: Solve for x
    x = 536,771.16/856.61
  6. Step 6: Final answer
    x = 626.62

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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.