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Finding the Fourth Proportional to 390.93, 583.85 and 354.29

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Solution

The fourth proportional to 390.93, 583.85 and 354.29 is: 529.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.93 : 583.85 = 354.29 : x
  2. Step 2: Convert to fraction form
    390.93/583.85 = 354.29/x
  3. Step 3: Cross multiply
    390.93x = 583.85 × 354.29
  4. Step 4: Simplify right side
    390.93x = 206,852.22
  5. Step 5: Solve for x
    x = 206,852.22/390.93
  6. Step 6: Final answer
    x = 529.13

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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.