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Finding the Fourth Proportional to 1,431.98, 2,147.90 and 701.31

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Solution

The fourth proportional to 1,431.98, 2,147.90 and 701.31 is: 1,051.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.98 : 2,147.90 = 701.31 : x
  2. Step 2: Convert to fraction form
    1,431.98/2,147.90 = 701.31/x
  3. Step 3: Cross multiply
    1,431.98x = 2,147.90 × 701.31
  4. Step 4: Simplify right side
    1,431.98x = 1,506,343.75
  5. Step 5: Solve for x
    x = 1,506,343.75/1,431.98
  6. Step 6: Final answer
    x = 1,051.93

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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.