Home / 30,777.27-42,507.64-20,688.19

Finding the Fourth Proportional to 30,777.27, 42,507.64 and 20,688.19

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Solution

The fourth proportional to 30,777.27, 42,507.64 and 20,688.19 is: 28,573.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,777.27 : 42,507.64 = 20,688.19 : x
  2. Step 2: Convert to fraction form
    30,777.27/42,507.64 = 20,688.19/x
  3. Step 3: Cross multiply
    30,777.27x = 42,507.64 × 20,688.19
  4. Step 4: Simplify right side
    30,777.27x = 879,405,816.79
  5. Step 5: Solve for x
    x = 879,405,816.79/30,777.27
  6. Step 6: Final answer
    x = 28,573.23

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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.