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Finding the Fourth Proportional to 391,687, 540,549.93 and 221,975.80

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Solution

The fourth proportional to 391,687, 540,549.93 and 221,975.80 is: 306,339.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,687 : 540,549.93 = 221,975.80 : x
  2. Step 2: Convert to fraction form
    391,687/540,549.93 = 221,975.80/x
  3. Step 3: Cross multiply
    391,687x = 540,549.93 × 221,975.80
  4. Step 4: Simplify right side
    391,687x = 119,989,003,151.69
  5. Step 5: Solve for x
    x = 119,989,003,151.69/391,687
  6. Step 6: Final answer
    x = 306,339.00

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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.