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Finding the Fourth Proportional to 740.43, 1,021.63 and 429.75

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Solution

The fourth proportional to 740.43, 1,021.63 and 429.75 is: 592.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.43 : 1,021.63 = 429.75 : x
  2. Step 2: Convert to fraction form
    740.43/1,021.63 = 429.75/x
  3. Step 3: Cross multiply
    740.43x = 1,021.63 × 429.75
  4. Step 4: Simplify right side
    740.43x = 439,045.49
  5. Step 5: Solve for x
    x = 439,045.49/740.43
  6. Step 6: Final answer
    x = 592.96

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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.