Home / 39,315.60-58,970.70-12,661.20

Finding the Fourth Proportional to 39,315.60, 58,970.70 and 12,661.20

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Solution

The fourth proportional to 39,315.60, 58,970.70 and 12,661.20 is: 18,990.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,315.60 : 58,970.70 = 12,661.20 : x
  2. Step 2: Convert to fraction form
    39,315.60/58,970.70 = 12,661.20/x
  3. Step 3: Cross multiply
    39,315.60x = 58,970.70 × 12,661.20
  4. Step 4: Simplify right side
    39,315.60x = 746,639,826.84
  5. Step 5: Solve for x
    x = 746,639,826.84/39,315.60
  6. Step 6: Final answer
    x = 18,990.93

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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.