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Finding the Fourth Proportional to 440.19, 657.18 and 391.59

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Solution

The fourth proportional to 440.19, 657.18 and 391.59 is: 584.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.19 : 657.18 = 391.59 : x
  2. Step 2: Convert to fraction form
    440.19/657.18 = 391.59/x
  3. Step 3: Cross multiply
    440.19x = 657.18 × 391.59
  4. Step 4: Simplify right side
    440.19x = 257,345.12
  5. Step 5: Solve for x
    x = 257,345.12/440.19
  6. Step 6: Final answer
    x = 584.62

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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.