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Finding the Fourth Proportional to 1,131.37, 1,697.64 and 438.50

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Solution

The fourth proportional to 1,131.37, 1,697.64 and 438.50 is: 657.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.37 : 1,697.64 = 438.50 : x
  2. Step 2: Convert to fraction form
    1,131.37/1,697.64 = 438.50/x
  3. Step 3: Cross multiply
    1,131.37x = 1,697.64 × 438.50
  4. Step 4: Simplify right side
    1,131.37x = 744,415.14
  5. Step 5: Solve for x
    x = 744,415.14/1,131.37
  6. Step 6: Final answer
    x = 657.98

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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.