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Finding the Fourth Proportional to 1,486.25, 2,051.43 and 988.64

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Solution

The fourth proportional to 1,486.25, 2,051.43 and 988.64 is: 1,364.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,486.25 : 2,051.43 = 988.64 : x
  2. Step 2: Convert to fraction form
    1,486.25/2,051.43 = 988.64/x
  3. Step 3: Cross multiply
    1,486.25x = 2,051.43 × 988.64
  4. Step 4: Simplify right side
    1,486.25x = 2,028,125.76
  5. Step 5: Solve for x
    x = 2,028,125.76/1,486.25
  6. Step 6: Final answer
    x = 1,364.59

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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.