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Finding the Fourth Proportional to 89,870.40, 134,805.60 and 72,374.40

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Solution

The fourth proportional to 89,870.40, 134,805.60 and 72,374.40 is: 108,561.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,870.40 : 134,805.60 = 72,374.40 : x
  2. Step 2: Convert to fraction form
    89,870.40/134,805.60 = 72,374.40/x
  3. Step 3: Cross multiply
    89,870.40x = 134,805.60 × 72,374.40
  4. Step 4: Simplify right side
    89,870.40x = 9,756,474,416.64
  5. Step 5: Solve for x
    x = 9,756,474,416.64/89,870.40
  6. Step 6: Final answer
    x = 108,561.60

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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.