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Finding the Fourth Proportional to 239,160, 330,040.80 and 138,616.32

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Solution

The fourth proportional to 239,160, 330,040.80 and 138,616.32 is: 191,290.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    239,160 : 330,040.80 = 138,616.32 : x
  2. Step 2: Convert to fraction form
    239,160/330,040.80 = 138,616.32/x
  3. Step 3: Cross multiply
    239,160x = 330,040.80 × 138,616.32
  4. Step 4: Simplify right side
    239,160x = 45,749,041,145.86
  5. Step 5: Solve for x
    x = 45,749,041,145.86/239,160
  6. Step 6: Final answer
    x = 191,290.52

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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.