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Finding the Fourth Proportional to 1,012.38, 1,397.11 and 619.62

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Solution

The fourth proportional to 1,012.38, 1,397.11 and 619.62 is: 855.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.38 : 1,397.11 = 619.62 : x
  2. Step 2: Convert to fraction form
    1,012.38/1,397.11 = 619.62/x
  3. Step 3: Cross multiply
    1,012.38x = 1,397.11 × 619.62
  4. Step 4: Simplify right side
    1,012.38x = 865,677.30
  5. Step 5: Solve for x
    x = 865,677.30/1,012.38
  6. Step 6: Final answer
    x = 855.09

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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.