Home / 390,812.25-539,320.92-221,042.73

Finding the Fourth Proportional to 390,812.25, 539,320.92 and 221,042.73

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Solution

The fourth proportional to 390,812.25, 539,320.92 and 221,042.73 is: 305,038.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,812.25 : 539,320.92 = 221,042.73 : x
  2. Step 2: Convert to fraction form
    390,812.25/539,320.92 = 221,042.73/x
  3. Step 3: Cross multiply
    390,812.25x = 539,320.92 × 221,042.73
  4. Step 4: Simplify right side
    390,812.25x = 119,212,968,502.91
  5. Step 5: Solve for x
    x = 119,212,968,502.91/390,812.25
  6. Step 6: Final answer
    x = 305,038.98

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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.