Home / 30,814.21-42,484.46-20,721.21

Finding the Fourth Proportional to 30,814.21, 42,484.46 and 20,721.21

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Solution

The fourth proportional to 30,814.21, 42,484.46 and 20,721.21 is: 28,568.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,814.21 : 42,484.46 = 20,721.21 : x
  2. Step 2: Convert to fraction form
    30,814.21/42,484.46 = 20,721.21/x
  3. Step 3: Cross multiply
    30,814.21x = 42,484.46 × 20,721.21
  4. Step 4: Simplify right side
    30,814.21x = 880,329,417.40
  5. Step 5: Solve for x
    x = 880,329,417.40/30,814.21
  6. Step 6: Final answer
    x = 28,568.94

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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.