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Finding the Fourth Proportional to 390,777, 539,272.26 and 221,007.48

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Solution

The fourth proportional to 390,777, 539,272.26 and 221,007.48 is: 304,990.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,777 : 539,272.26 = 221,007.48 : x
  2. Step 2: Convert to fraction form
    390,777/539,272.26 = 221,007.48/x
  3. Step 3: Cross multiply
    390,777x = 539,272.26 × 221,007.48
  4. Step 4: Simplify right side
    390,777x = 119,183,203,216.51
  5. Step 5: Solve for x
    x = 119,183,203,216.51/390,777
  6. Step 6: Final answer
    x = 304,990.32

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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.