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Finding the Fourth Proportional to 740.61, 1,021.74 and 445.95

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Solution

The fourth proportional to 740.61, 1,021.74 and 445.95 is: 615.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.61 : 1,021.74 = 445.95 : x
  2. Step 2: Convert to fraction form
    740.61/1,021.74 = 445.95/x
  3. Step 3: Cross multiply
    740.61x = 1,021.74 × 445.95
  4. Step 4: Simplify right side
    740.61x = 455,644.95
  5. Step 5: Solve for x
    x = 455,644.95/740.61
  6. Step 6: Final answer
    x = 615.23

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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.