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Finding the Fourth Proportional to 30,751.80, 46,127.70 and 21,420.60

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Solution

The fourth proportional to 30,751.80, 46,127.70 and 21,420.60 is: 32,130.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,751.80 : 46,127.70 = 21,420.60 : x
  2. Step 2: Convert to fraction form
    30,751.80/46,127.70 = 21,420.60/x
  3. Step 3: Cross multiply
    30,751.80x = 46,127.70 × 21,420.60
  4. Step 4: Simplify right side
    30,751.80x = 988,083,010.62
  5. Step 5: Solve for x
    x = 988,083,010.62/30,751.80
  6. Step 6: Final answer
    x = 32,130.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.