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Finding the Fourth Proportional to 1,423.74, 2,134.35 and 557.45

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Solution

The fourth proportional to 1,423.74, 2,134.35 and 557.45 is: 835.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,423.74 : 2,134.35 = 557.45 : x
  2. Step 2: Convert to fraction form
    1,423.74/2,134.35 = 557.45/x
  3. Step 3: Cross multiply
    1,423.74x = 2,134.35 × 557.45
  4. Step 4: Simplify right side
    1,423.74x = 1,189,782.74
  5. Step 5: Solve for x
    x = 1,189,782.74/1,423.74
  6. Step 6: Final answer
    x = 835.67

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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.