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Finding the Fourth Proportional to 777.26, 1,165.71 and 430.49

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Solution

The fourth proportional to 777.26, 1,165.71 and 430.49 is: 645.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.26 : 1,165.71 = 430.49 : x
  2. Step 2: Convert to fraction form
    777.26/1,165.71 = 430.49/x
  3. Step 3: Cross multiply
    777.26x = 1,165.71 × 430.49
  4. Step 4: Simplify right side
    777.26x = 501,826.50
  5. Step 5: Solve for x
    x = 501,826.50/777.26
  6. Step 6: Final answer
    x = 645.64

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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.