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Finding the Fourth Proportional to 621.69, 931.69 and 437.59

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Solution

The fourth proportional to 621.69, 931.69 and 437.59 is: 655.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.69 : 931.69 = 437.59 : x
  2. Step 2: Convert to fraction form
    621.69/931.69 = 437.59/x
  3. Step 3: Cross multiply
    621.69x = 931.69 × 437.59
  4. Step 4: Simplify right side
    621.69x = 407,698.23
  5. Step 5: Solve for x
    x = 407,698.23/621.69
  6. Step 6: Final answer
    x = 655.79

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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.