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Finding the Fourth Proportional to 384.72, 530.26 and 311.01

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Solution

The fourth proportional to 384.72, 530.26 and 311.01 is: 428.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.72 : 530.26 = 311.01 : x
  2. Step 2: Convert to fraction form
    384.72/530.26 = 311.01/x
  3. Step 3: Cross multiply
    384.72x = 530.26 × 311.01
  4. Step 4: Simplify right side
    384.72x = 164,913.40
  5. Step 5: Solve for x
    x = 164,913.40/384.72
  6. Step 6: Final answer
    x = 428.66

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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.