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Finding the Fourth Proportional to 840.23, 1,159.39 and 467.21

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Solution

The fourth proportional to 840.23, 1,159.39 and 467.21 is: 644.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.23 : 1,159.39 = 467.21 : x
  2. Step 2: Convert to fraction form
    840.23/1,159.39 = 467.21/x
  3. Step 3: Cross multiply
    840.23x = 1,159.39 × 467.21
  4. Step 4: Simplify right side
    840.23x = 541,681.50
  5. Step 5: Solve for x
    x = 541,681.50/840.23
  6. Step 6: Final answer
    x = 644.68

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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.