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Finding the Fourth Proportional to 1,918.90, 2,878.04 and 686.10

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Solution

The fourth proportional to 1,918.90, 2,878.04 and 686.10 is: 1,029.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918.90 : 2,878.04 = 686.10 : x
  2. Step 2: Convert to fraction form
    1,918.90/2,878.04 = 686.10/x
  3. Step 3: Cross multiply
    1,918.90x = 2,878.04 × 686.10
  4. Step 4: Simplify right side
    1,918.90x = 1,974,623.24
  5. Step 5: Solve for x
    x = 1,974,623.24/1,918.90
  6. Step 6: Final answer
    x = 1,029.04

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.