Home / 128,742.04-177,663.78-72,153.40

Finding the Fourth Proportional to 128,742.04, 177,663.78 and 72,153.40

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Solution

The fourth proportional to 128,742.04, 177,663.78 and 72,153.40 is: 99,571.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,742.04 : 177,663.78 = 72,153.40 : x
  2. Step 2: Convert to fraction form
    128,742.04/177,663.78 = 72,153.40/x
  3. Step 3: Cross multiply
    128,742.04x = 177,663.78 × 72,153.40
  4. Step 4: Simplify right side
    128,742.04x = 12,819,045,783.85
  5. Step 5: Solve for x
    x = 12,819,045,783.85/128,742.04
  6. Step 6: Final answer
    x = 99,571.56

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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.