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Finding the Fourth Proportional to 89,635.40, 123,807.70 and 65,724.20

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Solution

The fourth proportional to 89,635.40, 123,807.70 and 65,724.20 is: 90,780.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,635.40 : 123,807.70 = 65,724.20 : x
  2. Step 2: Convert to fraction form
    89,635.40/123,807.70 = 65,724.20/x
  3. Step 3: Cross multiply
    89,635.40x = 123,807.70 × 65,724.20
  4. Step 4: Simplify right side
    89,635.40x = 8,137,162,036.34
  5. Step 5: Solve for x
    x = 8,137,162,036.34/89,635.40
  6. Step 6: Final answer
    x = 90,780.67

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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.