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Finding the Fourth Proportional to 740.63, 1,022.07 and 445.90

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Solution

The fourth proportional to 740.63, 1,022.07 and 445.90 is: 615.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.63 : 1,022.07 = 445.90 : x
  2. Step 2: Convert to fraction form
    740.63/1,022.07 = 445.90/x
  3. Step 3: Cross multiply
    740.63x = 1,022.07 × 445.90
  4. Step 4: Simplify right side
    740.63x = 455,738.46
  5. Step 5: Solve for x
    x = 455,738.46/740.63
  6. Step 6: Final answer
    x = 615.34

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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.