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Finding the Fourth Proportional to 1,380.98, 2,071.42 and 651.36

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Solution

The fourth proportional to 1,380.98, 2,071.42 and 651.36 is: 977.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.98 : 2,071.42 = 651.36 : x
  2. Step 2: Convert to fraction form
    1,380.98/2,071.42 = 651.36/x
  3. Step 3: Cross multiply
    1,380.98x = 2,071.42 × 651.36
  4. Step 4: Simplify right side
    1,380.98x = 1,349,240.13
  5. Step 5: Solve for x
    x = 1,349,240.13/1,380.98
  6. Step 6: Final answer
    x = 977.02

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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.