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Finding the Fourth Proportional to 842.48, 1,263.47 and 279.50

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Solution

The fourth proportional to 842.48, 1,263.47 and 279.50 is: 419.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.48 : 1,263.47 = 279.50 : x
  2. Step 2: Convert to fraction form
    842.48/1,263.47 = 279.50/x
  3. Step 3: Cross multiply
    842.48x = 1,263.47 × 279.50
  4. Step 4: Simplify right side
    842.48x = 353,139.26
  5. Step 5: Solve for x
    x = 353,139.26/842.48
  6. Step 6: Final answer
    x = 419.17

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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.