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Finding the Fourth Proportional to 113,491.20, 170,236.80 and 89,990.40

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Solution

The fourth proportional to 113,491.20, 170,236.80 and 89,990.40 is: 134,985.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    113,491.20 : 170,236.80 = 89,990.40 : x
  2. Step 2: Convert to fraction form
    113,491.20/170,236.80 = 89,990.40/x
  3. Step 3: Cross multiply
    113,491.20x = 170,236.80 × 89,990.40
  4. Step 4: Simplify right side
    113,491.20x = 15,319,677,726.72
  5. Step 5: Solve for x
    x = 15,319,677,726.72/113,491.20
  6. Step 6: Final answer
    x = 134,985.60

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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.