Home / 28,918-39,905.22-20,970.28

Finding the Fourth Proportional to 28,918, 39,905.22 and 20,970.28

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Solution

The fourth proportional to 28,918, 39,905.22 and 20,970.28 is: 28,937.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,918 : 39,905.22 = 20,970.28 : x
  2. Step 2: Convert to fraction form
    28,918/39,905.22 = 20,970.28/x
  3. Step 3: Cross multiply
    28,918x = 39,905.22 × 20,970.28
  4. Step 4: Simplify right side
    28,918x = 836,823,636.86
  5. Step 5: Solve for x
    x = 836,823,636.86/28,918
  6. Step 6: Final answer
    x = 28,937.81

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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.