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Finding the Fourth Proportional to 842.32, 1,162.40 and 469.28

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Solution

The fourth proportional to 842.32, 1,162.40 and 469.28 is: 647.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.32 : 1,162.40 = 469.28 : x
  2. Step 2: Convert to fraction form
    842.32/1,162.40 = 469.28/x
  3. Step 3: Cross multiply
    842.32x = 1,162.40 × 469.28
  4. Step 4: Simplify right side
    842.32x = 545,491.07
  5. Step 5: Solve for x
    x = 545,491.07/842.32
  6. Step 6: Final answer
    x = 647.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.