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Finding the Fourth Proportional to 1,017.88, 1,404.48 and 644.92

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Solution

The fourth proportional to 1,017.88, 1,404.48 and 644.92 is: 889.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,017.88 : 1,404.48 = 644.92 : x
  2. Step 2: Convert to fraction form
    1,017.88/1,404.48 = 644.92/x
  3. Step 3: Cross multiply
    1,017.88x = 1,404.48 × 644.92
  4. Step 4: Simplify right side
    1,017.88x = 905,777.24
  5. Step 5: Solve for x
    x = 905,777.24/1,017.88
  6. Step 6: Final answer
    x = 889.87

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1.5x scale

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.