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Finding the Fourth Proportional to 390,295.31, 538,600.50 and 220,525.79

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Solution

The fourth proportional to 390,295.31, 538,600.50 and 220,525.79 is: 304,321.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,295.31 : 538,600.50 = 220,525.79 : x
  2. Step 2: Convert to fraction form
    390,295.31/538,600.50 = 220,525.79/x
  3. Step 3: Cross multiply
    390,295.31x = 538,600.50 × 220,525.79
  4. Step 4: Simplify right side
    390,295.31x = 118,775,298,063.89
  5. Step 5: Solve for x
    x = 118,775,298,063.89/390,295.31
  6. Step 6: Final answer
    x = 304,321.62

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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.