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Finding the Fourth Proportional to 1,921.90, 2,883.12 and 688.93

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Solution

The fourth proportional to 1,921.90, 2,883.12 and 688.93 is: 1,033.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.90 : 2,883.12 = 688.93 : x
  2. Step 2: Convert to fraction form
    1,921.90/2,883.12 = 688.93/x
  3. Step 3: Cross multiply
    1,921.90x = 2,883.12 × 688.93
  4. Step 4: Simplify right side
    1,921.90x = 1,986,267.86
  5. Step 5: Solve for x
    x = 1,986,267.86/1,921.90
  6. Step 6: Final answer
    x = 1,033.49

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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.