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Finding the Fourth Proportional to 430.24, 644.84 and 256.98

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Solution

The fourth proportional to 430.24, 644.84 and 256.98 is: 385.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.24 : 644.84 = 256.98 : x
  2. Step 2: Convert to fraction form
    430.24/644.84 = 256.98/x
  3. Step 3: Cross multiply
    430.24x = 644.84 × 256.98
  4. Step 4: Simplify right side
    430.24x = 165,710.98
  5. Step 5: Solve for x
    x = 165,710.98/430.24
  6. Step 6: Final answer
    x = 385.16

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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.