Home / 210,388.16-290,346.54-128,690.80

Finding the Fourth Proportional to 210,388.16, 290,346.54 and 128,690.80

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Solution

The fourth proportional to 210,388.16, 290,346.54 and 128,690.80 is: 177,599.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,388.16 : 290,346.54 = 128,690.80 : x
  2. Step 2: Convert to fraction form
    210,388.16/290,346.54 = 128,690.80/x
  3. Step 3: Cross multiply
    210,388.16x = 290,346.54 × 128,690.80
  4. Step 4: Simplify right side
    210,388.16x = 37,364,928,509.83
  5. Step 5: Solve for x
    x = 37,364,928,509.83/210,388.16
  6. Step 6: Final answer
    x = 177,599.96

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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.