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Finding the Fourth Proportional to 89,855.40, 134,783.10 and 72,359.40

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Solution

The fourth proportional to 89,855.40, 134,783.10 and 72,359.40 is: 108,539.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,855.40 : 134,783.10 = 72,359.40 : x
  2. Step 2: Convert to fraction form
    89,855.40/134,783.10 = 72,359.40/x
  3. Step 3: Cross multiply
    89,855.40x = 134,783.10 × 72,359.40
  4. Step 4: Simplify right side
    89,855.40x = 9,752,824,246.14
  5. Step 5: Solve for x
    x = 9,752,824,246.14/89,855.40
  6. Step 6: Final answer
    x = 108,539.10

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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.