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Finding the Fourth Proportional to 1,008.38, 1,390.64 and 634.76

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Solution

The fourth proportional to 1,008.38, 1,390.64 and 634.76 is: 875.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.38 : 1,390.64 = 634.76 : x
  2. Step 2: Convert to fraction form
    1,008.38/1,390.64 = 634.76/x
  3. Step 3: Cross multiply
    1,008.38x = 1,390.64 × 634.76
  4. Step 4: Simplify right side
    1,008.38x = 882,722.65
  5. Step 5: Solve for x
    x = 882,722.65/1,008.38
  6. Step 6: Final answer
    x = 875.39

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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.