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Finding the Fourth Proportional to 777.86, 1,164.80 and 430.80

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Solution

The fourth proportional to 777.86, 1,164.80 and 430.80 is: 645.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.86 : 1,164.80 = 430.80 : x
  2. Step 2: Convert to fraction form
    777.86/1,164.80 = 430.80/x
  3. Step 3: Cross multiply
    777.86x = 1,164.80 × 430.80
  4. Step 4: Simplify right side
    777.86x = 501,795.84
  5. Step 5: Solve for x
    x = 501,795.84/777.86
  6. Step 6: Final answer
    x = 645.10

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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.