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Finding the Fourth Proportional to 391,653.37, 540,483.47 and 221,920.57

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Solution

The fourth proportional to 391,653.37, 540,483.47 and 221,920.57 is: 306,251.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,653.37 : 540,483.47 = 221,920.57 : x
  2. Step 2: Convert to fraction form
    391,653.37/540,483.47 = 221,920.57/x
  3. Step 3: Cross multiply
    391,653.37x = 540,483.47 × 221,920.57
  4. Step 4: Simplify right side
    391,653.37x = 119,944,399,737.98
  5. Step 5: Solve for x
    x = 119,944,399,737.98/391,653.37
  6. Step 6: Final answer
    x = 306,251.42

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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.