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Finding the Fourth Proportional to 1,012.40, 1,397.48 and 619.44

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Solution

The fourth proportional to 1,012.40, 1,397.48 and 619.44 is: 855.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.40 : 1,397.48 = 619.44 : x
  2. Step 2: Convert to fraction form
    1,012.40/1,397.48 = 619.44/x
  3. Step 3: Cross multiply
    1,012.40x = 1,397.48 × 619.44
  4. Step 4: Simplify right side
    1,012.40x = 865,655.01
  5. Step 5: Solve for x
    x = 865,655.01/1,012.40
  6. Step 6: Final answer
    x = 855.05

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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.