Home / 1,386.56-2,064.70-1,315.28

Finding the Fourth Proportional to 1,386.56, 2,064.70 and 1,315.28

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Solution

The fourth proportional to 1,386.56, 2,064.70 and 1,315.28 is: 1,958.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.56 : 2,064.70 = 1,315.28 : x
  2. Step 2: Convert to fraction form
    1,386.56/2,064.70 = 1,315.28/x
  3. Step 3: Cross multiply
    1,386.56x = 2,064.70 × 1,315.28
  4. Step 4: Simplify right side
    1,386.56x = 2,715,658.62
  5. Step 5: Solve for x
    x = 2,715,658.62/1,386.56
  6. Step 6: Final answer
    x = 1,958.56

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.