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Finding the Fourth Proportional to 210,489.60, 315,619.20 and 85,689.60

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Solution

The fourth proportional to 210,489.60, 315,619.20 and 85,689.60 is: 128,487.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,489.60 : 315,619.20 = 85,689.60 : x
  2. Step 2: Convert to fraction form
    210,489.60/315,619.20 = 85,689.60/x
  3. Step 3: Cross multiply
    210,489.60x = 315,619.20 × 85,689.60
  4. Step 4: Simplify right side
    210,489.60x = 27,045,283,000.32
  5. Step 5: Solve for x
    x = 27,045,283,000.32/210,489.60
  6. Step 6: Final answer
    x = 128,487.50

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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.