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Finding the Fourth Proportional to 139,586.80, 209,315.40 and 60,660.40

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Solution

The fourth proportional to 139,586.80, 209,315.40 and 60,660.40 is: 90,962.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,586.80 : 209,315.40 = 60,660.40 : x
  2. Step 2: Convert to fraction form
    139,586.80/209,315.40 = 60,660.40/x
  3. Step 3: Cross multiply
    139,586.80x = 209,315.40 × 60,660.40
  4. Step 4: Simplify right side
    139,586.80x = 12,697,155,890.16
  5. Step 5: Solve for x
    x = 12,697,155,890.16/139,586.80
  6. Step 6: Final answer
    x = 90,962.44

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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.