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Finding the Fourth Proportional to 740.80, 1,111.20 and 307.99

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Solution

The fourth proportional to 740.80, 1,111.20 and 307.99 is: 461.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.80 : 1,111.20 = 307.99 : x
  2. Step 2: Convert to fraction form
    740.80/1,111.20 = 307.99/x
  3. Step 3: Cross multiply
    740.80x = 1,111.20 × 307.99
  4. Step 4: Simplify right side
    740.80x = 342,238.49
  5. Step 5: Solve for x
    x = 342,238.49/740.80
  6. Step 6: Final answer
    x = 461.99

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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.