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Finding the Fourth Proportional to 509.78, 703.56 and 313.28

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Solution

The fourth proportional to 509.78, 703.56 and 313.28 is: 432.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.78 : 703.56 = 313.28 : x
  2. Step 2: Convert to fraction form
    509.78/703.56 = 313.28/x
  3. Step 3: Cross multiply
    509.78x = 703.56 × 313.28
  4. Step 4: Simplify right side
    509.78x = 220,411.28
  5. Step 5: Solve for x
    x = 220,411.28/509.78
  6. Step 6: Final answer
    x = 432.37

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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.