Home / 42,976.40-64,477.80-20,515.74

Finding the Fourth Proportional to 42,976.40, 64,477.80 and 20,515.74

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Solution

The fourth proportional to 42,976.40, 64,477.80 and 20,515.74 is: 30,779.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,976.40 : 64,477.80 = 20,515.74 : x
  2. Step 2: Convert to fraction form
    42,976.40/64,477.80 = 20,515.74/x
  3. Step 3: Cross multiply
    42,976.40x = 64,477.80 × 20,515.74
  4. Step 4: Simplify right side
    42,976.40x = 1,322,809,780.57
  5. Step 5: Solve for x
    x = 1,322,809,780.57/42,976.40
  6. Step 6: Final answer
    x = 30,779.91

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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.