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Finding the Fourth Proportional to 1,385.58, 1,913.40 and 889.09

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Solution

The fourth proportional to 1,385.58, 1,913.40 and 889.09 is: 1,227.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.58 : 1,913.40 = 889.09 : x
  2. Step 2: Convert to fraction form
    1,385.58/1,913.40 = 889.09/x
  3. Step 3: Cross multiply
    1,385.58x = 1,913.40 × 889.09
  4. Step 4: Simplify right side
    1,385.58x = 1,701,184.81
  5. Step 5: Solve for x
    x = 1,701,184.81/1,385.58
  6. Step 6: Final answer
    x = 1,227.78

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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.