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Finding the Fourth Proportional to 1,259.69, 1,889.70 and 437.75

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Solution

The fourth proportional to 1,259.69, 1,889.70 and 437.75 is: 656.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.69 : 1,889.70 = 437.75 : x
  2. Step 2: Convert to fraction form
    1,259.69/1,889.70 = 437.75/x
  3. Step 3: Cross multiply
    1,259.69x = 1,889.70 × 437.75
  4. Step 4: Simplify right side
    1,259.69x = 827,216.18
  5. Step 5: Solve for x
    x = 827,216.18/1,259.69
  6. Step 6: Final answer
    x = 656.68

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Double scale
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1.5x scale

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.