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Finding the Fourth Proportional to 840.79, 1,160.43 and 486.65

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Solution

The fourth proportional to 840.79, 1,160.43 and 486.65 is: 671.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.79 : 1,160.43 = 486.65 : x
  2. Step 2: Convert to fraction form
    840.79/1,160.43 = 486.65/x
  3. Step 3: Cross multiply
    840.79x = 1,160.43 × 486.65
  4. Step 4: Simplify right side
    840.79x = 564,723.26
  5. Step 5: Solve for x
    x = 564,723.26/840.79
  6. Step 6: Final answer
    x = 671.66

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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.