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Finding the Fourth Proportional to 391,389.39, 540,117.36 and 221,623.50

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Solution

The fourth proportional to 391,389.39, 540,117.36 and 221,623.50 is: 305,840.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,389.39 : 540,117.36 = 221,623.50 : x
  2. Step 2: Convert to fraction form
    391,389.39/540,117.36 = 221,623.50/x
  3. Step 3: Cross multiply
    391,389.39x = 540,117.36 × 221,623.50
  4. Step 4: Simplify right side
    391,389.39x = 119,702,699,733.96
  5. Step 5: Solve for x
    x = 119,702,699,733.96/391,389.39
  6. Step 6: Final answer
    x = 305,840.43

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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.