Home / 128,590.80-177,453.36-72,004.32

Finding the Fourth Proportional to 128,590.80, 177,453.36 and 72,004.32

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Solution

The fourth proportional to 128,590.80, 177,453.36 and 72,004.32 is: 99,364.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,590.80 : 177,453.36 = 72,004.32 : x
  2. Step 2: Convert to fraction form
    128,590.80/177,453.36 = 72,004.32/x
  3. Step 3: Cross multiply
    128,590.80x = 177,453.36 × 72,004.32
  4. Step 4: Simplify right side
    128,590.80x = 12,777,408,518.52
  5. Step 5: Solve for x
    x = 12,777,408,518.52/128,590.80
  6. Step 6: Final answer
    x = 99,364.87

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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.