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Finding the Fourth Proportional to 780.80, 1,076.25 and 570.98

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Solution

The fourth proportional to 780.80, 1,076.25 and 570.98 is: 787.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.80 : 1,076.25 = 570.98 : x
  2. Step 2: Convert to fraction form
    780.80/1,076.25 = 570.98/x
  3. Step 3: Cross multiply
    780.80x = 1,076.25 × 570.98
  4. Step 4: Simplify right side
    780.80x = 614,511.84
  5. Step 5: Solve for x
    x = 614,511.84/780.80
  6. Step 6: Final answer
    x = 787.03

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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.