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Finding the Fourth Proportional to 384.64, 530.64 and 218.72

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Solution

The fourth proportional to 384.64, 530.64 and 218.72 is: 301.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.64 : 530.64 = 218.72 : x
  2. Step 2: Convert to fraction form
    384.64/530.64 = 218.72/x
  3. Step 3: Cross multiply
    384.64x = 530.64 × 218.72
  4. Step 4: Simplify right side
    384.64x = 116,058.93
  5. Step 5: Solve for x
    x = 116,058.93/384.64
  6. Step 6: Final answer
    x = 301.74

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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.