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Finding the Fourth Proportional to 458,212.70, 687,491.85 and 221,764.70

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Solution

The fourth proportional to 458,212.70, 687,491.85 and 221,764.70 is: 332,730.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,212.70 : 687,491.85 = 221,764.70 : x
  2. Step 2: Convert to fraction form
    458,212.70/687,491.85 = 221,764.70/x
  3. Step 3: Cross multiply
    458,212.70x = 687,491.85 × 221,764.70
  4. Step 4: Simplify right side
    458,212.70x = 152,461,423,867.70
  5. Step 5: Solve for x
    x = 152,461,423,867.70/458,212.70
  6. Step 6: Final answer
    x = 332,730.68

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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.