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Finding the Fourth Proportional to 1,315.44, 1,971.18 and 1,040.40

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Solution

The fourth proportional to 1,315.44, 1,971.18 and 1,040.40 is: 1,559.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.44 : 1,971.18 = 1,040.40 : x
  2. Step 2: Convert to fraction form
    1,315.44/1,971.18 = 1,040.40/x
  3. Step 3: Cross multiply
    1,315.44x = 1,971.18 × 1,040.40
  4. Step 4: Simplify right side
    1,315.44x = 2,050,815.67
  5. Step 5: Solve for x
    x = 2,050,815.67/1,315.44
  6. Step 6: Final answer
    x = 1,559.03

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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.