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Finding the Fourth Proportional to 390.60, 583.56 and 344.88

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Solution

The fourth proportional to 390.60, 583.56 and 344.88 is: 515.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.60 : 583.56 = 344.88 : x
  2. Step 2: Convert to fraction form
    390.60/583.56 = 344.88/x
  3. Step 3: Cross multiply
    390.60x = 583.56 × 344.88
  4. Step 4: Simplify right side
    390.60x = 201,258.17
  5. Step 5: Solve for x
    x = 201,258.17/390.60
  6. Step 6: Final answer
    x = 515.25

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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.