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Finding the Fourth Proportional to 210,078.72, 289,856.88 and 128,386.08

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Solution

The fourth proportional to 210,078.72, 289,856.88 and 128,386.08 is: 177,141.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,078.72 : 289,856.88 = 128,386.08 : x
  2. Step 2: Convert to fraction form
    210,078.72/289,856.88 = 128,386.08/x
  3. Step 3: Cross multiply
    210,078.72x = 289,856.88 × 128,386.08
  4. Step 4: Simplify right side
    210,078.72x = 37,213,588,584.23
  5. Step 5: Solve for x
    x = 37,213,588,584.23/210,078.72
  6. Step 6: Final answer
    x = 177,141.16

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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.