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Finding the Fourth Proportional to 1,918, 2,647.20 and 1,090

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Solution

The fourth proportional to 1,918, 2,647.20 and 1,090 is: 1,504.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918 : 2,647.20 = 1,090 : x
  2. Step 2: Convert to fraction form
    1,918/2,647.20 = 1,090/x
  3. Step 3: Cross multiply
    1,918x = 2,647.20 × 1,090
  4. Step 4: Simplify right side
    1,918x = 2,885,448
  5. Step 5: Solve for x
    x = 2,885,448/1,918
  6. Step 6: Final answer
    x = 1,504.40

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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.