Home / 1,319,111.60-1,978,012.20-420,436.40

Finding the Fourth Proportional to 1,319,111.60, 1,978,012.20 and 420,436.40

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Solution

The fourth proportional to 1,319,111.60, 1,978,012.20 and 420,436.40 is: 630,445.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319,111.60 : 1,978,012.20 = 420,436.40 : x
  2. Step 2: Convert to fraction form
    1,319,111.60/1,978,012.20 = 420,436.40/x
  3. Step 3: Cross multiply
    1,319,111.60x = 1,978,012.20 × 420,436.40
  4. Step 4: Simplify right side
    1,319,111.60x = 831,628,328,524.08
  5. Step 5: Solve for x
    x = 831,628,328,524.08/1,319,111.60
  6. Step 6: Final answer
    x = 630,445.77

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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.