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Finding the Fourth Proportional to 390,856.19, 539,336.21 and 218,783.78

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Solution

The fourth proportional to 390,856.19, 539,336.21 and 218,783.78 is: 301,896.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,856.19 : 539,336.21 = 218,783.78 : x
  2. Step 2: Convert to fraction form
    390,856.19/539,336.21 = 218,783.78/x
  3. Step 3: Cross multiply
    390,856.19x = 539,336.21 × 218,783.78
  4. Step 4: Simplify right side
    390,856.19x = 117,998,010,924.07
  5. Step 5: Solve for x
    x = 117,998,010,924.07/390,856.19
  6. Step 6: Final answer
    x = 301,896.24

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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.