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Finding the Fourth Proportional to 856.90, 1,284.93 and 445.93

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Solution

The fourth proportional to 856.90, 1,284.93 and 445.93 is: 668.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.90 : 1,284.93 = 445.93 : x
  2. Step 2: Convert to fraction form
    856.90/1,284.93 = 445.93/x
  3. Step 3: Cross multiply
    856.90x = 1,284.93 × 445.93
  4. Step 4: Simplify right side
    856.90x = 572,988.83
  5. Step 5: Solve for x
    x = 572,988.83/856.90
  6. Step 6: Final answer
    x = 668.68

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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.