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Finding the Fourth Proportional to 740.80, 1,021.80 and 516.34

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Solution

The fourth proportional to 740.80, 1,021.80 and 516.34 is: 712.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.80 : 1,021.80 = 516.34 : x
  2. Step 2: Convert to fraction form
    740.80/1,021.80 = 516.34/x
  3. Step 3: Cross multiply
    740.80x = 1,021.80 × 516.34
  4. Step 4: Simplify right side
    740.80x = 527,596.21
  5. Step 5: Solve for x
    x = 527,596.21/740.80
  6. Step 6: Final answer
    x = 712.20

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1.5x scale

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.