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Finding the Fourth Proportional to 1,005.81, 1,508.87 and 356.39

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Solution

The fourth proportional to 1,005.81, 1,508.87 and 356.39 is: 534.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.81 : 1,508.87 = 356.39 : x
  2. Step 2: Convert to fraction form
    1,005.81/1,508.87 = 356.39/x
  3. Step 3: Cross multiply
    1,005.81x = 1,508.87 × 356.39
  4. Step 4: Simplify right side
    1,005.81x = 537,748.17
  5. Step 5: Solve for x
    x = 537,748.17/1,005.81
  6. Step 6: Final answer
    x = 534.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.