Home / 1,397.45-1,929.78-900.94

Finding the Fourth Proportional to 1,397.45, 1,929.78 and 900.94

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Solution

The fourth proportional to 1,397.45, 1,929.78 and 900.94 is: 1,244.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.45 : 1,929.78 = 900.94 : x
  2. Step 2: Convert to fraction form
    1,397.45/1,929.78 = 900.94/x
  3. Step 3: Cross multiply
    1,397.45x = 1,929.78 × 900.94
  4. Step 4: Simplify right side
    1,397.45x = 1,738,611.49
  5. Step 5: Solve for x
    x = 1,738,611.49/1,397.45
  6. Step 6: Final answer
    x = 1,244.14

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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.