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Finding the Fourth Proportional to 740.64, 1,021.30 and 553.84

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Solution

The fourth proportional to 740.64, 1,021.30 and 553.84 is: 763.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.64 : 1,021.30 = 553.84 : x
  2. Step 2: Convert to fraction form
    740.64/1,021.30 = 553.84/x
  3. Step 3: Cross multiply
    740.64x = 1,021.30 × 553.84
  4. Step 4: Simplify right side
    740.64x = 565,636.79
  5. Step 5: Solve for x
    x = 565,636.79/740.64
  6. Step 6: Final answer
    x = 763.71

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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.