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Finding the Fourth Proportional to 1,670.69, 2,505.80 and 438.01

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Solution

The fourth proportional to 1,670.69, 2,505.80 and 438.01 is: 656.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,670.69 : 2,505.80 = 438.01 : x
  2. Step 2: Convert to fraction form
    1,670.69/2,505.80 = 438.01/x
  3. Step 3: Cross multiply
    1,670.69x = 2,505.80 × 438.01
  4. Step 4: Simplify right side
    1,670.69x = 1,097,560.29
  5. Step 5: Solve for x
    x = 1,097,560.29/1,670.69
  6. Step 6: Final answer
    x = 656.95

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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.