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Finding the Fourth Proportional to 390.73, 586.70 and 309.93

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Solution

The fourth proportional to 390.73, 586.70 and 309.93 is: 465.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.73 : 586.70 = 309.93 : x
  2. Step 2: Convert to fraction form
    390.73/586.70 = 309.93/x
  3. Step 3: Cross multiply
    390.73x = 586.70 × 309.93
  4. Step 4: Simplify right side
    390.73x = 181,835.93
  5. Step 5: Solve for x
    x = 181,835.93/390.73
  6. Step 6: Final answer
    x = 465.37

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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.