Home / 142,989.87-197,319.40-78,457.50

Finding the Fourth Proportional to 142,989.87, 197,319.40 and 78,457.50

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Solution

The fourth proportional to 142,989.87, 197,319.40 and 78,457.50 is: 108,267.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,989.87 : 197,319.40 = 78,457.50 : x
  2. Step 2: Convert to fraction form
    142,989.87/197,319.40 = 78,457.50/x
  3. Step 3: Cross multiply
    142,989.87x = 197,319.40 × 78,457.50
  4. Step 4: Simplify right side
    142,989.87x = 15,481,186,825.50
  5. Step 5: Solve for x
    x = 15,481,186,825.50/142,989.87
  6. Step 6: Final answer
    x = 108,267.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.