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Finding the Fourth Proportional to 1,040.83, 1,435.65 and 1,005.19

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Solution

The fourth proportional to 1,040.83, 1,435.65 and 1,005.19 is: 1,386.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.83 : 1,435.65 = 1,005.19 : x
  2. Step 2: Convert to fraction form
    1,040.83/1,435.65 = 1,005.19/x
  3. Step 3: Cross multiply
    1,040.83x = 1,435.65 × 1,005.19
  4. Step 4: Simplify right side
    1,040.83x = 1,443,101.02
  5. Step 5: Solve for x
    x = 1,443,101.02/1,040.83
  6. Step 6: Final answer
    x = 1,386.49

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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.