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Finding the Fourth Proportional to 289,719.40, 434,319.90 and 112,167.40

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Solution

The fourth proportional to 289,719.40, 434,319.90 and 112,167.40 is: 168,150.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,719.40 : 434,319.90 = 112,167.40 : x
  2. Step 2: Convert to fraction form
    289,719.40/434,319.90 = 112,167.40/x
  3. Step 3: Cross multiply
    289,719.40x = 434,319.90 × 112,167.40
  4. Step 4: Simplify right side
    289,719.40x = 48,716,533,951.26
  5. Step 5: Solve for x
    x = 48,716,533,951.26/289,719.40
  6. Step 6: Final answer
    x = 168,150.75

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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.