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Finding the Fourth Proportional to 3,437.69, 5,156.51 and 840.60

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Solution

The fourth proportional to 3,437.69, 5,156.51 and 840.60 is: 1,260.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,437.69 : 5,156.51 = 840.60 : x
  2. Step 2: Convert to fraction form
    3,437.69/5,156.51 = 840.60/x
  3. Step 3: Cross multiply
    3,437.69x = 5,156.51 × 840.60
  4. Step 4: Simplify right side
    3,437.69x = 4,334,558.10
  5. Step 5: Solve for x
    x = 4,334,558.10/3,437.69
  6. Step 6: Final answer
    x = 1,260.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.