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Finding the Fourth Proportional to 780.93, 1,077.34 and 486.29

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Solution

The fourth proportional to 780.93, 1,077.34 and 486.29 is: 670.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.93 : 1,077.34 = 486.29 : x
  2. Step 2: Convert to fraction form
    780.93/1,077.34 = 486.29/x
  3. Step 3: Cross multiply
    780.93x = 1,077.34 × 486.29
  4. Step 4: Simplify right side
    780.93x = 523,899.67
  5. Step 5: Solve for x
    x = 523,899.67/780.93
  6. Step 6: Final answer
    x = 670.87

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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.