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Finding the Fourth Proportional to 1,008.06, 1,390.60 and 634.34

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Solution

The fourth proportional to 1,008.06, 1,390.60 and 634.34 is: 875.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.06 : 1,390.60 = 634.34 : x
  2. Step 2: Convert to fraction form
    1,008.06/1,390.60 = 634.34/x
  3. Step 3: Cross multiply
    1,008.06x = 1,390.60 × 634.34
  4. Step 4: Simplify right side
    1,008.06x = 882,113.20
  5. Step 5: Solve for x
    x = 882,113.20/1,008.06
  6. Step 6: Final answer
    x = 875.06

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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.