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Finding the Fourth Proportional to 740.32, 1,021.72 and 445.76

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Solution

The fourth proportional to 740.32, 1,021.72 and 445.76 is: 615.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.32 : 1,021.72 = 445.76 : x
  2. Step 2: Convert to fraction form
    740.32/1,021.72 = 445.76/x
  3. Step 3: Cross multiply
    740.32x = 1,021.72 × 445.76
  4. Step 4: Simplify right side
    740.32x = 455,441.91
  5. Step 5: Solve for x
    x = 455,441.91/740.32
  6. Step 6: Final answer
    x = 615.20

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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.