Home / 390,984.40-539,560.20-221,251.60

Finding the Fourth Proportional to 390,984.40, 539,560.20 and 221,251.60

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Solution

The fourth proportional to 390,984.40, 539,560.20 and 221,251.60 is: 305,328.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,984.40 : 539,560.20 = 221,251.60 : x
  2. Step 2: Convert to fraction form
    390,984.40/539,560.20 = 221,251.60/x
  3. Step 3: Cross multiply
    390,984.40x = 539,560.20 × 221,251.60
  4. Step 4: Simplify right side
    390,984.40x = 119,378,557,546.32
  5. Step 5: Solve for x
    x = 119,378,557,546.32/390,984.40
  6. Step 6: Final answer
    x = 305,328.19

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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.