Home / 1,440.51-1,985.90-1,218.57

Finding the Fourth Proportional to 1,440.51, 1,985.90 and 1,218.57

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Solution

The fourth proportional to 1,440.51, 1,985.90 and 1,218.57 is: 1,679.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,440.51 : 1,985.90 = 1,218.57 : x
  2. Step 2: Convert to fraction form
    1,440.51/1,985.90 = 1,218.57/x
  3. Step 3: Cross multiply
    1,440.51x = 1,985.90 × 1,218.57
  4. Step 4: Simplify right side
    1,440.51x = 2,419,952.07
  5. Step 5: Solve for x
    x = 2,419,952.07/1,440.51
  6. Step 6: Final answer
    x = 1,679.93

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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.