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Finding the Fourth Proportional to 779.84, 1,075.52 and 572.80

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Solution

The fourth proportional to 779.84, 1,075.52 and 572.80 is: 789.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.84 : 1,075.52 = 572.80 : x
  2. Step 2: Convert to fraction form
    779.84/1,075.52 = 572.80/x
  3. Step 3: Cross multiply
    779.84x = 1,075.52 × 572.80
  4. Step 4: Simplify right side
    779.84x = 616,057.86
  5. Step 5: Solve for x
    x = 616,057.86/779.84
  6. Step 6: Final answer
    x = 789.98

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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.