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Finding the Fourth Proportional to 1,215.74, 1,819.28 and 890.30

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Solution

The fourth proportional to 1,215.74, 1,819.28 and 890.30 is: 1,332.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.74 : 1,819.28 = 890.30 : x
  2. Step 2: Convert to fraction form
    1,215.74/1,819.28 = 890.30/x
  3. Step 3: Cross multiply
    1,215.74x = 1,819.28 × 890.30
  4. Step 4: Simplify right side
    1,215.74x = 1,619,698.11
  5. Step 5: Solve for x
    x = 1,619,698.11/1,215.74
  6. Step 6: Final answer
    x = 1,332.28

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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.