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Finding the Fourth Proportional to 390.81, 583.49 and 351.93

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Solution

The fourth proportional to 390.81, 583.49 and 351.93 is: 525.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.81 : 583.49 = 351.93 : x
  2. Step 2: Convert to fraction form
    390.81/583.49 = 351.93/x
  3. Step 3: Cross multiply
    390.81x = 583.49 × 351.93
  4. Step 4: Simplify right side
    390.81x = 205,347.64
  5. Step 5: Solve for x
    x = 205,347.64/390.81
  6. Step 6: Final answer
    x = 525.44

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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.