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Finding the Fourth Proportional to 390.19, 585.29 and 368.49

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Solution

The fourth proportional to 390.19, 585.29 and 368.49 is: 552.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.19 : 585.29 = 368.49 : x
  2. Step 2: Convert to fraction form
    390.19/585.29 = 368.49/x
  3. Step 3: Cross multiply
    390.19x = 585.29 × 368.49
  4. Step 4: Simplify right side
    390.19x = 215,673.51
  5. Step 5: Solve for x
    x = 215,673.51/390.19
  6. Step 6: Final answer
    x = 552.74

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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.