Home / 989,973.60-1,483,617.20-420,640.80

Finding the Fourth Proportional to 989,973.60, 1,483,617.20 and 420,640.80

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Solution

The fourth proportional to 989,973.60, 1,483,617.20 and 420,640.80 is: 630,390.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    989,973.60 : 1,483,617.20 = 420,640.80 : x
  2. Step 2: Convert to fraction form
    989,973.60/1,483,617.20 = 420,640.80/x
  3. Step 3: Cross multiply
    989,973.60x = 1,483,617.20 × 420,640.80
  4. Step 4: Simplify right side
    989,973.60x = 624,069,923,798.56
  5. Step 5: Solve for x
    x = 624,069,923,798.56/989,973.60
  6. Step 6: Final answer
    x = 630,390.47

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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.