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Finding the Fourth Proportional to 1,876.99, 2,815.80 and 644.08

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Solution

The fourth proportional to 1,876.99, 2,815.80 and 644.08 is: 966.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,876.99 : 2,815.80 = 644.08 : x
  2. Step 2: Convert to fraction form
    1,876.99/2,815.80 = 644.08/x
  3. Step 3: Cross multiply
    1,876.99x = 2,815.80 × 644.08
  4. Step 4: Simplify right side
    1,876.99x = 1,813,600.46
  5. Step 5: Solve for x
    x = 1,813,600.46/1,876.99
  6. Step 6: Final answer
    x = 966.23

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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.