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Finding the Fourth Proportional to 77,680.80, 116,444.40 and 30,871.20

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Solution

The fourth proportional to 77,680.80, 116,444.40 and 30,871.20 is: 46,276.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,680.80 : 116,444.40 = 30,871.20 : x
  2. Step 2: Convert to fraction form
    77,680.80/116,444.40 = 30,871.20/x
  3. Step 3: Cross multiply
    77,680.80x = 116,444.40 × 30,871.20
  4. Step 4: Simplify right side
    77,680.80x = 3,594,778,361.28
  5. Step 5: Solve for x
    x = 3,594,778,361.28/77,680.80
  6. Step 6: Final answer
    x = 46,276.28

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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.