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Finding the Fourth Proportional to 563.69, 777.90 and 315.03

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Solution

The fourth proportional to 563.69, 777.90 and 315.03 is: 434.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    563.69 : 777.90 = 315.03 : x
  2. Step 2: Convert to fraction form
    563.69/777.90 = 315.03/x
  3. Step 3: Cross multiply
    563.69x = 777.90 × 315.03
  4. Step 4: Simplify right side
    563.69x = 245,061.84
  5. Step 5: Solve for x
    x = 245,061.84/563.69
  6. Step 6: Final answer
    x = 434.75

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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.