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Finding the Fourth Proportional to 390,785.84, 539,385.82 and 221,118.38

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Solution

The fourth proportional to 390,785.84, 539,385.82 and 221,118.38 is: 305,200.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,785.84 : 539,385.82 = 221,118.38 : x
  2. Step 2: Convert to fraction form
    390,785.84/539,385.82 = 221,118.38/x
  3. Step 3: Cross multiply
    390,785.84x = 539,385.82 × 221,118.38
  4. Step 4: Simplify right side
    390,785.84x = 119,268,118,713.37
  5. Step 5: Solve for x
    x = 119,268,118,713.37/390,785.84
  6. Step 6: Final answer
    x = 305,200.72

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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.