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Finding the Fourth Proportional to 385.46, 578.40 and 317.58

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Solution

The fourth proportional to 385.46, 578.40 and 317.58 is: 476.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.46 : 578.40 = 317.58 : x
  2. Step 2: Convert to fraction form
    385.46/578.40 = 317.58/x
  3. Step 3: Cross multiply
    385.46x = 578.40 × 317.58
  4. Step 4: Simplify right side
    385.46x = 183,688.27
  5. Step 5: Solve for x
    x = 183,688.27/385.46
  6. Step 6: Final answer
    x = 476.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.