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Finding the Fourth Proportional to 740.21, 1,020.78 and 474.36

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Solution

The fourth proportional to 740.21, 1,020.78 and 474.36 is: 654.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.21 : 1,020.78 = 474.36 : x
  2. Step 2: Convert to fraction form
    740.21/1,020.78 = 474.36/x
  3. Step 3: Cross multiply
    740.21x = 1,020.78 × 474.36
  4. Step 4: Simplify right side
    740.21x = 484,217.20
  5. Step 5: Solve for x
    x = 484,217.20/740.21
  6. Step 6: Final answer
    x = 654.16

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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.