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Finding the Fourth Proportional to 1,380.62, 2,070.12 and 649.19

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Solution

The fourth proportional to 1,380.62, 2,070.12 and 649.19 is: 973.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.62 : 2,070.12 = 649.19 : x
  2. Step 2: Convert to fraction form
    1,380.62/2,070.12 = 649.19/x
  3. Step 3: Cross multiply
    1,380.62x = 2,070.12 × 649.19
  4. Step 4: Simplify right side
    1,380.62x = 1,343,901.20
  5. Step 5: Solve for x
    x = 1,343,901.20/1,380.62
  6. Step 6: Final answer
    x = 973.40

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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.