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Finding the Fourth Proportional to 30,860.80, 46,218.30 and 20,946.40

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Solution

The fourth proportional to 30,860.80, 46,218.30 and 20,946.40 is: 31,370.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,860.80 : 46,218.30 = 20,946.40 : x
  2. Step 2: Convert to fraction form
    30,860.80/46,218.30 = 20,946.40/x
  3. Step 3: Cross multiply
    30,860.80x = 46,218.30 × 20,946.40
  4. Step 4: Simplify right side
    30,860.80x = 968,106,999.12
  5. Step 5: Solve for x
    x = 968,106,999.12/30,860.80
  6. Step 6: Final answer
    x = 31,370.12

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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.