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Finding the Fourth Proportional to 1,437.42, 1,985.10 and 939.87

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Solution

The fourth proportional to 1,437.42, 1,985.10 and 939.87 is: 1,297.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,437.42 : 1,985.10 = 939.87 : x
  2. Step 2: Convert to fraction form
    1,437.42/1,985.10 = 939.87/x
  3. Step 3: Cross multiply
    1,437.42x = 1,985.10 × 939.87
  4. Step 4: Simplify right side
    1,437.42x = 1,865,735.94
  5. Step 5: Solve for x
    x = 1,865,735.94/1,437.42
  6. Step 6: Final answer
    x = 1,297.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.