Home / 1,989.90-2,746.14-1,105.80

Finding the Fourth Proportional to 1,989.90, 2,746.14 and 1,105.80

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Solution

The fourth proportional to 1,989.90, 2,746.14 and 1,105.80 is: 1,526.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.90 : 2,746.14 = 1,105.80 : x
  2. Step 2: Convert to fraction form
    1,989.90/2,746.14 = 1,105.80/x
  3. Step 3: Cross multiply
    1,989.90x = 2,746.14 × 1,105.80
  4. Step 4: Simplify right side
    1,989.90x = 3,036,681.61
  5. Step 5: Solve for x
    x = 3,036,681.61/1,989.90
  6. Step 6: Final answer
    x = 1,526.05

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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.