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Finding the Fourth Proportional to 390.09, 584.91 and 313.53

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Solution

The fourth proportional to 390.09, 584.91 and 313.53 is: 470.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.09 : 584.91 = 313.53 : x
  2. Step 2: Convert to fraction form
    390.09/584.91 = 313.53/x
  3. Step 3: Cross multiply
    390.09x = 584.91 × 313.53
  4. Step 4: Simplify right side
    390.09x = 183,386.83
  5. Step 5: Solve for x
    x = 183,386.83/390.09
  6. Step 6: Final answer
    x = 470.11

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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.