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Finding the Fourth Proportional to 856.88, 1,287.76 and 424.34

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Solution

The fourth proportional to 856.88, 1,287.76 and 424.34 is: 637.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.88 : 1,287.76 = 424.34 : x
  2. Step 2: Convert to fraction form
    856.88/1,287.76 = 424.34/x
  3. Step 3: Cross multiply
    856.88x = 1,287.76 × 424.34
  4. Step 4: Simplify right side
    856.88x = 546,448.08
  5. Step 5: Solve for x
    x = 546,448.08/856.88
  6. Step 6: Final answer
    x = 637.72

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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.