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Finding the Fourth Proportional to 415.64, 623.76 and 390.14

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Solution

The fourth proportional to 415.64, 623.76 and 390.14 is: 585.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.64 : 623.76 = 390.14 : x
  2. Step 2: Convert to fraction form
    415.64/623.76 = 390.14/x
  3. Step 3: Cross multiply
    415.64x = 623.76 × 390.14
  4. Step 4: Simplify right side
    415.64x = 243,353.73
  5. Step 5: Solve for x
    x = 243,353.73/415.64
  6. Step 6: Final answer
    x = 585.49

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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.