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Finding the Fourth Proportional to 840.56, 1,159.72 and 491.12

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Solution

The fourth proportional to 840.56, 1,159.72 and 491.12 is: 677.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.56 : 1,159.72 = 491.12 : x
  2. Step 2: Convert to fraction form
    840.56/1,159.72 = 491.12/x
  3. Step 3: Cross multiply
    840.56x = 1,159.72 × 491.12
  4. Step 4: Simplify right side
    840.56x = 569,561.69
  5. Step 5: Solve for x
    x = 569,561.69/840.56
  6. Step 6: Final answer
    x = 677.60

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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.