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Finding the Fourth Proportional to 384.54, 530.64 and 356.70

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Solution

The fourth proportional to 384.54, 530.64 and 356.70 is: 492.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    384.54 : 530.64 = 356.70 : x
  2. Step 2: Convert to fraction form
    384.54/530.64 = 356.70/x
  3. Step 3: Cross multiply
    384.54x = 530.64 × 356.70
  4. Step 4: Simplify right side
    384.54x = 189,279.29
  5. Step 5: Solve for x
    x = 189,279.29/384.54
  6. Step 6: Final answer
    x = 492.22

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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.