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Finding the Fourth Proportional to 210,390.80, 315,432.60 and 85,667.60

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Solution

The fourth proportional to 210,390.80, 315,432.60 and 85,667.60 is: 128,438.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,390.80 : 315,432.60 = 85,667.60 : x
  2. Step 2: Convert to fraction form
    210,390.80/315,432.60 = 85,667.60/x
  3. Step 3: Cross multiply
    210,390.80x = 315,432.60 × 85,667.60
  4. Step 4: Simplify right side
    210,390.80x = 27,022,353,803.76
  5. Step 5: Solve for x
    x = 27,022,353,803.76/210,390.80
  6. Step 6: Final answer
    x = 128,438.86

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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.