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Finding the Fourth Proportional to 780.97, 1,076.66 and 624.13

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Solution

The fourth proportional to 780.97, 1,076.66 and 624.13 is: 860.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.97 : 1,076.66 = 624.13 : x
  2. Step 2: Convert to fraction form
    780.97/1,076.66 = 624.13/x
  3. Step 3: Cross multiply
    780.97x = 1,076.66 × 624.13
  4. Step 4: Simplify right side
    780.97x = 671,967.30
  5. Step 5: Solve for x
    x = 671,967.30/780.97
  6. Step 6: Final answer
    x = 860.43

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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.