Home / 1,985.98-2,740.64-1,089.72

Finding the Fourth Proportional to 1,985.98, 2,740.64 and 1,089.72

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Solution

The fourth proportional to 1,985.98, 2,740.64 and 1,089.72 is: 1,503.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.98 : 2,740.64 = 1,089.72 : x
  2. Step 2: Convert to fraction form
    1,985.98/2,740.64 = 1,089.72/x
  3. Step 3: Cross multiply
    1,985.98x = 2,740.64 × 1,089.72
  4. Step 4: Simplify right side
    1,985.98x = 2,986,511.07
  5. Step 5: Solve for x
    x = 2,986,511.07/1,985.98
  6. Step 6: Final answer
    x = 1,503.80

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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.