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Finding the Fourth Proportional to 42,908.40, 64,405.80 and 20,739.60

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Solution

The fourth proportional to 42,908.40, 64,405.80 and 20,739.60 is: 31,130.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,908.40 : 64,405.80 = 20,739.60 : x
  2. Step 2: Convert to fraction form
    42,908.40/64,405.80 = 20,739.60/x
  3. Step 3: Cross multiply
    42,908.40x = 64,405.80 × 20,739.60
  4. Step 4: Simplify right side
    42,908.40x = 1,335,750,529.68
  5. Step 5: Solve for x
    x = 1,335,750,529.68/42,908.40
  6. Step 6: Final answer
    x = 31,130.28

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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.