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Finding the Fourth Proportional to 82,813.60, 124,220.40 and 78,731.20

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Solution

The fourth proportional to 82,813.60, 124,220.40 and 78,731.20 is: 118,096.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,813.60 : 124,220.40 = 78,731.20 : x
  2. Step 2: Convert to fraction form
    82,813.60/124,220.40 = 78,731.20/x
  3. Step 3: Cross multiply
    82,813.60x = 124,220.40 × 78,731.20
  4. Step 4: Simplify right side
    82,813.60x = 9,780,021,156.48
  5. Step 5: Solve for x
    x = 9,780,021,156.48/82,813.60
  6. Step 6: Final answer
    x = 118,096.80

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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.