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Finding the Fourth Proportional to 390.49, 583.10 and 339.26

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Solution

The fourth proportional to 390.49, 583.10 and 339.26 is: 506.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.49 : 583.10 = 339.26 : x
  2. Step 2: Convert to fraction form
    390.49/583.10 = 339.26/x
  3. Step 3: Cross multiply
    390.49x = 583.10 × 339.26
  4. Step 4: Simplify right side
    390.49x = 197,819.17
  5. Step 5: Solve for x
    x = 197,819.17/390.49
  6. Step 6: Final answer
    x = 506.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.