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Finding the Fourth Proportional to 740.70, 1,020.63 and 519.90

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Solution

The fourth proportional to 740.70, 1,020.63 and 519.90 is: 716.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.70 : 1,020.63 = 519.90 : x
  2. Step 2: Convert to fraction form
    740.70/1,020.63 = 519.90/x
  3. Step 3: Cross multiply
    740.70x = 1,020.63 × 519.90
  4. Step 4: Simplify right side
    740.70x = 530,625.54
  5. Step 5: Solve for x
    x = 530,625.54/740.70
  6. Step 6: Final answer
    x = 716.38

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Double scale
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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.