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Finding the Fourth Proportional to 840.21, 1,159.47 and 467.18

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Solution

The fourth proportional to 840.21, 1,159.47 and 467.18 is: 644.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.21 : 1,159.47 = 467.18 : x
  2. Step 2: Convert to fraction form
    840.21/1,159.47 = 467.18/x
  3. Step 3: Cross multiply
    840.21x = 1,159.47 × 467.18
  4. Step 4: Simplify right side
    840.21x = 541,678.86
  5. Step 5: Solve for x
    x = 541,678.86/840.21
  6. Step 6: Final answer
    x = 644.69

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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.