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Finding the Fourth Proportional to 210,947.16, 316,422 and 86,288.16

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Solution

The fourth proportional to 210,947.16, 316,422 and 86,288.16 is: 129,432.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,947.16 : 316,422 = 86,288.16 : x
  2. Step 2: Convert to fraction form
    210,947.16/316,422 = 86,288.16/x
  3. Step 3: Cross multiply
    210,947.16x = 316,422 × 86,288.16
  4. Step 4: Simplify right side
    210,947.16x = 27,303,472,163.52
  5. Step 5: Solve for x
    x = 27,303,472,163.52/210,947.16
  6. Step 6: Final answer
    x = 129,432.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.