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Finding the Fourth Proportional to 390.64, 586.12 and 207.98

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Solution

The fourth proportional to 390.64, 586.12 and 207.98 is: 312.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.64 : 586.12 = 207.98 : x
  2. Step 2: Convert to fraction form
    390.64/586.12 = 207.98/x
  3. Step 3: Cross multiply
    390.64x = 586.12 × 207.98
  4. Step 4: Simplify right side
    390.64x = 121,904.55
  5. Step 5: Solve for x
    x = 121,904.55/390.64
  6. Step 6: Final answer
    x = 312.07

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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.