Home / 644,619.20-966,928.80-420,670.40

Finding the Fourth Proportional to 644,619.20, 966,928.80 and 420,670.40

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Solution

The fourth proportional to 644,619.20, 966,928.80 and 420,670.40 is: 631,005.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,619.20 : 966,928.80 = 420,670.40 : x
  2. Step 2: Convert to fraction form
    644,619.20/966,928.80 = 420,670.40/x
  3. Step 3: Cross multiply
    644,619.20x = 966,928.80 × 420,670.40
  4. Step 4: Simplify right side
    644,619.20x = 406,758,325,067.52
  5. Step 5: Solve for x
    x = 406,758,325,067.52/644,619.20
  6. Step 6: Final answer
    x = 631,005.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.