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Finding the Fourth Proportional to 1,008.14, 1,390.59 and 634.80

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Solution

The fourth proportional to 1,008.14, 1,390.59 and 634.80 is: 875.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.14 : 1,390.59 = 634.80 : x
  2. Step 2: Convert to fraction form
    1,008.14/1,390.59 = 634.80/x
  3. Step 3: Cross multiply
    1,008.14x = 1,390.59 × 634.80
  4. Step 4: Simplify right side
    1,008.14x = 882,746.53
  5. Step 5: Solve for x
    x = 882,746.53/1,008.14
  6. Step 6: Final answer
    x = 875.62

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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.