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Finding the Fourth Proportional to 124,812.80, 186,830.40 and 72,065.60

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Solution

The fourth proportional to 124,812.80, 186,830.40 and 72,065.60 is: 107,873.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,812.80 : 186,830.40 = 72,065.60 : x
  2. Step 2: Convert to fraction form
    124,812.80/186,830.40 = 72,065.60/x
  3. Step 3: Cross multiply
    124,812.80x = 186,830.40 × 72,065.60
  4. Step 4: Simplify right side
    124,812.80x = 13,464,044,874.24
  5. Step 5: Solve for x
    x = 13,464,044,874.24/124,812.80
  6. Step 6: Final answer
    x = 107,873.91

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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.