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Finding the Fourth Proportional to 783.20, 1,079.52 and 561.80

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Solution

The fourth proportional to 783.20, 1,079.52 and 561.80 is: 774.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.20 : 1,079.52 = 561.80 : x
  2. Step 2: Convert to fraction form
    783.20/1,079.52 = 561.80/x
  3. Step 3: Cross multiply
    783.20x = 1,079.52 × 561.80
  4. Step 4: Simplify right side
    783.20x = 606,474.34
  5. Step 5: Solve for x
    x = 606,474.34/783.20
  6. Step 6: Final answer
    x = 774.35

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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.