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Finding the Fourth Proportional to 856.50, 1,284.98 and 491.42

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Solution

The fourth proportional to 856.50, 1,284.98 and 491.42 is: 737.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.50 : 1,284.98 = 491.42 : x
  2. Step 2: Convert to fraction form
    856.50/1,284.98 = 491.42/x
  3. Step 3: Cross multiply
    856.50x = 1,284.98 × 491.42
  4. Step 4: Simplify right side
    856.50x = 631,455.99
  5. Step 5: Solve for x
    x = 631,455.99/856.50
  6. Step 6: Final answer
    x = 737.25

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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.