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Finding the Fourth Proportional to 84,820.40, 127,230.60 and 78,405.20

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Solution

The fourth proportional to 84,820.40, 127,230.60 and 78,405.20 is: 117,607.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,820.40 : 127,230.60 = 78,405.20 : x
  2. Step 2: Convert to fraction form
    84,820.40/127,230.60 = 78,405.20/x
  3. Step 3: Cross multiply
    84,820.40x = 127,230.60 × 78,405.20
  4. Step 4: Simplify right side
    84,820.40x = 9,975,540,639.12
  5. Step 5: Solve for x
    x = 9,975,540,639.12/84,820.40
  6. Step 6: Final answer
    x = 117,607.80

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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.