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Finding the Fourth Proportional to 1,381.18, 2,070.79 and 650.38

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Solution

The fourth proportional to 1,381.18, 2,070.79 and 650.38 is: 975.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.18 : 2,070.79 = 650.38 : x
  2. Step 2: Convert to fraction form
    1,381.18/2,070.79 = 650.38/x
  3. Step 3: Cross multiply
    1,381.18x = 2,070.79 × 650.38
  4. Step 4: Simplify right side
    1,381.18x = 1,346,800.40
  5. Step 5: Solve for x
    x = 1,346,800.40/1,381.18
  6. Step 6: Final answer
    x = 975.11

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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.