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Finding the Fourth Proportional to 390,879.35, 539,415.50 and 221,109.83

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Solution

The fourth proportional to 390,879.35, 539,415.50 and 221,109.83 is: 305,132.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,879.35 : 539,415.50 = 221,109.83 : x
  2. Step 2: Convert to fraction form
    390,879.35/539,415.50 = 221,109.83/x
  3. Step 3: Cross multiply
    390,879.35x = 539,415.50 × 221,109.83
  4. Step 4: Simplify right side
    390,879.35x = 119,270,065,701.74
  5. Step 5: Solve for x
    x = 119,270,065,701.74/390,879.35
  6. Step 6: Final answer
    x = 305,132.69

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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.