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Finding the Fourth Proportional to 1,012.60, 1,397.40 and 619.63

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Solution

The fourth proportional to 1,012.60, 1,397.40 and 619.63 is: 855.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.60 : 1,397.40 = 619.63 : x
  2. Step 2: Convert to fraction form
    1,012.60/1,397.40 = 619.63/x
  3. Step 3: Cross multiply
    1,012.60x = 1,397.40 × 619.63
  4. Step 4: Simplify right side
    1,012.60x = 865,876.49
  5. Step 5: Solve for x
    x = 865,876.49/1,012.60
  6. Step 6: Final answer
    x = 855.10

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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.