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Finding the Fourth Proportional to 948.80, 1,420.80 and 756.80

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Solution

The fourth proportional to 948.80, 1,420.80 and 756.80 is: 1,133.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.80 : 1,420.80 = 756.80 : x
  2. Step 2: Convert to fraction form
    948.80/1,420.80 = 756.80/x
  3. Step 3: Cross multiply
    948.80x = 1,420.80 × 756.80
  4. Step 4: Simplify right side
    948.80x = 1,075,261.44
  5. Step 5: Solve for x
    x = 1,075,261.44/948.80
  6. Step 6: Final answer
    x = 1,133.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.