Home / 30,936.61-42,666.16-20,851.80

Finding the Fourth Proportional to 30,936.61, 42,666.16 and 20,851.80

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Solution

The fourth proportional to 30,936.61, 42,666.16 and 20,851.80 is: 28,757.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,936.61 : 42,666.16 = 20,851.80 : x
  2. Step 2: Convert to fraction form
    30,936.61/42,666.16 = 20,851.80/x
  3. Step 3: Cross multiply
    30,936.61x = 42,666.16 × 20,851.80
  4. Step 4: Simplify right side
    30,936.61x = 889,666,235.09
  5. Step 5: Solve for x
    x = 889,666,235.09/30,936.61
  6. Step 6: Final answer
    x = 28,757.72

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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.