Home / 385,143.93-531,538.34-221,805.79

Finding the Fourth Proportional to 385,143.93, 531,538.34 and 221,805.79

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Solution

The fourth proportional to 385,143.93, 531,538.34 and 221,805.79 is: 306,114.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,143.93 : 531,538.34 = 221,805.79 : x
  2. Step 2: Convert to fraction form
    385,143.93/531,538.34 = 221,805.79/x
  3. Step 3: Cross multiply
    385,143.93x = 531,538.34 × 221,805.79
  4. Step 4: Simplify right side
    385,143.93x = 117,898,278,981.11
  5. Step 5: Solve for x
    x = 117,898,278,981.11/385,143.93
  6. Step 6: Final answer
    x = 306,114.86

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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.