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Finding the Fourth Proportional to 647.12, 892.76 and 384.88

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Solution

The fourth proportional to 647.12, 892.76 and 384.88 is: 530.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.12 : 892.76 = 384.88 : x
  2. Step 2: Convert to fraction form
    647.12/892.76 = 384.88/x
  3. Step 3: Cross multiply
    647.12x = 892.76 × 384.88
  4. Step 4: Simplify right side
    647.12x = 343,605.47
  5. Step 5: Solve for x
    x = 343,605.47/647.12
  6. Step 6: Final answer
    x = 530.98

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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.