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Finding the Fourth Proportional to 669.40, 1,002.90 and 573.40

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Solution

The fourth proportional to 669.40, 1,002.90 and 573.40 is: 859.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.40 : 1,002.90 = 573.40 : x
  2. Step 2: Convert to fraction form
    669.40/1,002.90 = 573.40/x
  3. Step 3: Cross multiply
    669.40x = 1,002.90 × 573.40
  4. Step 4: Simplify right side
    669.40x = 575,062.86
  5. Step 5: Solve for x
    x = 575,062.86/669.40
  6. Step 6: Final answer
    x = 859.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.