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Finding the Fourth Proportional to 840.63, 1,159.88 and 491.43

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Solution

The fourth proportional to 840.63, 1,159.88 and 491.43 is: 678.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.63 : 1,159.88 = 491.43 : x
  2. Step 2: Convert to fraction form
    840.63/1,159.88 = 491.43/x
  3. Step 3: Cross multiply
    840.63x = 1,159.88 × 491.43
  4. Step 4: Simplify right side
    840.63x = 569,997.37
  5. Step 5: Solve for x
    x = 569,997.37/840.63
  6. Step 6: Final answer
    x = 678.06

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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.