Home / 128,735.50-177,665.93-72,157.81

Finding the Fourth Proportional to 128,735.50, 177,665.93 and 72,157.81

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Solution

The fourth proportional to 128,735.50, 177,665.93 and 72,157.81 is: 99,583.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,735.50 : 177,665.93 = 72,157.81 : x
  2. Step 2: Convert to fraction form
    128,735.50/177,665.93 = 72,157.81/x
  3. Step 3: Cross multiply
    128,735.50x = 177,665.93 × 72,157.81
  4. Step 4: Simplify right side
    128,735.50x = 12,819,984,420.41
  5. Step 5: Solve for x
    x = 12,819,984,420.41/128,735.50
  6. Step 6: Final answer
    x = 99,583.91

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1.5x scale

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.