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Finding the Fourth Proportional to 1,356.90, 2,023.90 and 1,315.90

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Solution

The fourth proportional to 1,356.90, 2,023.90 and 1,315.90 is: 1,962.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,356.90 : 2,023.90 = 1,315.90 : x
  2. Step 2: Convert to fraction form
    1,356.90/2,023.90 = 1,315.90/x
  3. Step 3: Cross multiply
    1,356.90x = 2,023.90 × 1,315.90
  4. Step 4: Simplify right side
    1,356.90x = 2,663,250.01
  5. Step 5: Solve for x
    x = 2,663,250.01/1,356.90
  6. Step 6: Final answer
    x = 1,962.75

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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.