Home / 30,928.23-42,698.75-21,509.55

Finding the Fourth Proportional to 30,928.23, 42,698.75 and 21,509.55

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Solution

The fourth proportional to 30,928.23, 42,698.75 and 21,509.55 is: 29,695.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,928.23 : 42,698.75 = 21,509.55 : x
  2. Step 2: Convert to fraction form
    30,928.23/42,698.75 = 21,509.55/x
  3. Step 3: Cross multiply
    30,928.23x = 42,698.75 × 21,509.55
  4. Step 4: Simplify right side
    30,928.23x = 918,430,790.51
  5. Step 5: Solve for x
    x = 918,430,790.51/30,928.23
  6. Step 6: Final answer
    x = 29,695.55

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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.