Home / 128,640.16-177,518.28-72,048.64

Finding the Fourth Proportional to 128,640.16, 177,518.28 and 72,048.64

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Solution

The fourth proportional to 128,640.16, 177,518.28 and 72,048.64 is: 99,424.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,640.16 : 177,518.28 = 72,048.64 : x
  2. Step 2: Convert to fraction form
    128,640.16/177,518.28 = 72,048.64/x
  3. Step 3: Cross multiply
    128,640.16x = 177,518.28 × 72,048.64
  4. Step 4: Simplify right side
    128,640.16x = 12,789,950,649.14
  5. Step 5: Solve for x
    x = 12,789,950,649.14/128,640.16
  6. Step 6: Final answer
    x = 99,424.24

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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.