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Finding the Fourth Proportional to 1,012.19, 1,396.85 and 619.20

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Solution

The fourth proportional to 1,012.19, 1,396.85 and 619.20 is: 854.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.19 : 1,396.85 = 619.20 : x
  2. Step 2: Convert to fraction form
    1,012.19/1,396.85 = 619.20/x
  3. Step 3: Cross multiply
    1,012.19x = 1,396.85 × 619.20
  4. Step 4: Simplify right side
    1,012.19x = 864,929.52
  5. Step 5: Solve for x
    x = 864,929.52/1,012.19
  6. Step 6: Final answer
    x = 854.51

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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.