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Finding the Fourth Proportional to 840.98, 1,160.54 and 486.90

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Solution

The fourth proportional to 840.98, 1,160.54 and 486.90 is: 671.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.98 : 1,160.54 = 486.90 : x
  2. Step 2: Convert to fraction form
    840.98/1,160.54 = 486.90/x
  3. Step 3: Cross multiply
    840.98x = 1,160.54 × 486.90
  4. Step 4: Simplify right side
    840.98x = 565,058.69
  5. Step 5: Solve for x
    x = 565,058.69/840.98
  6. Step 6: Final answer
    x = 671.91

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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.