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Finding the Fourth Proportional to 1,131.70, 1,697.55 and 1,018.30

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Solution

The fourth proportional to 1,131.70, 1,697.55 and 1,018.30 is: 1,527.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.70 : 1,697.55 = 1,018.30 : x
  2. Step 2: Convert to fraction form
    1,131.70/1,697.55 = 1,018.30/x
  3. Step 3: Cross multiply
    1,131.70x = 1,697.55 × 1,018.30
  4. Step 4: Simplify right side
    1,131.70x = 1,728,615.17
  5. Step 5: Solve for x
    x = 1,728,615.17/1,131.70
  6. Step 6: Final answer
    x = 1,527.45

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1.5x scale

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.