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Finding the Fourth Proportional to 385.68, 529.98 and 307.92

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Solution

The fourth proportional to 385.68, 529.98 and 307.92 is: 423.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.68 : 529.98 = 307.92 : x
  2. Step 2: Convert to fraction form
    385.68/529.98 = 307.92/x
  3. Step 3: Cross multiply
    385.68x = 529.98 × 307.92
  4. Step 4: Simplify right side
    385.68x = 163,191.44
  5. Step 5: Solve for x
    x = 163,191.44/385.68
  6. Step 6: Final answer
    x = 423.13

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.