Home / 128,912.90-177,901.02-72,325.48

Finding the Fourth Proportional to 128,912.90, 177,901.02 and 72,325.48

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Solution

The fourth proportional to 128,912.90, 177,901.02 and 72,325.48 is: 99,809.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,912.90 : 177,901.02 = 72,325.48 : x
  2. Step 2: Convert to fraction form
    128,912.90/177,901.02 = 72,325.48/x
  3. Step 3: Cross multiply
    128,912.90x = 177,901.02 × 72,325.48
  4. Step 4: Simplify right side
    128,912.90x = 12,866,776,663.99
  5. Step 5: Solve for x
    x = 12,866,776,663.99/128,912.90
  6. Step 6: Final answer
    x = 99,809.85

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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.