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Finding the Fourth Proportional to 30,485.49, 42,061.73 and 20,928.30

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Solution

The fourth proportional to 30,485.49, 42,061.73 and 20,928.30 is: 28,875.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,485.49 : 42,061.73 = 20,928.30 : x
  2. Step 2: Convert to fraction form
    30,485.49/42,061.73 = 20,928.30/x
  3. Step 3: Cross multiply
    30,485.49x = 42,061.73 × 20,928.30
  4. Step 4: Simplify right side
    30,485.49x = 880,280,399.32
  5. Step 5: Solve for x
    x = 880,280,399.32/30,485.49
  6. Step 6: Final answer
    x = 28,875.39

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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.