Home / 1,555.38-2,145.42-1,031.40

Finding the Fourth Proportional to 1,555.38, 2,145.42 and 1,031.40

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Solution

The fourth proportional to 1,555.38, 2,145.42 and 1,031.40 is: 1,422.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.38 : 2,145.42 = 1,031.40 : x
  2. Step 2: Convert to fraction form
    1,555.38/2,145.42 = 1,031.40/x
  3. Step 3: Cross multiply
    1,555.38x = 2,145.42 × 1,031.40
  4. Step 4: Simplify right side
    1,555.38x = 2,212,786.19
  5. Step 5: Solve for x
    x = 2,212,786.19/1,555.38
  6. Step 6: Final answer
    x = 1,422.67

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Double scale
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1.5x scale

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.