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Finding the Fourth Proportional to 1,039.14, 1,555.05 and 649.32

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Solution

The fourth proportional to 1,039.14, 1,555.05 and 649.32 is: 971.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.14 : 1,555.05 = 649.32 : x
  2. Step 2: Convert to fraction form
    1,039.14/1,555.05 = 649.32/x
  3. Step 3: Cross multiply
    1,039.14x = 1,555.05 × 649.32
  4. Step 4: Simplify right side
    1,039.14x = 1,009,725.07
  5. Step 5: Solve for x
    x = 1,009,725.07/1,039.14
  6. Step 6: Final answer
    x = 971.69

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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.