Home / 30,557.40-42,172.20-17,128.68

Finding the Fourth Proportional to 30,557.40, 42,172.20 and 17,128.68

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Solution

The fourth proportional to 30,557.40, 42,172.20 and 17,128.68 is: 23,639.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,557.40 : 42,172.20 = 17,128.68 : x
  2. Step 2: Convert to fraction form
    30,557.40/42,172.20 = 17,128.68/x
  3. Step 3: Cross multiply
    30,557.40x = 42,172.20 × 17,128.68
  4. Step 4: Simplify right side
    30,557.40x = 722,354,118.70
  5. Step 5: Solve for x
    x = 722,354,118.70/30,557.40
  6. Step 6: Final answer
    x = 23,639.25

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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.