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Finding the Fourth Proportional to 121,788.63, 168,068.25 and 71,487.63

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Solution

The fourth proportional to 121,788.63, 168,068.25 and 71,487.63 is: 98,652.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,788.63 : 168,068.25 = 71,487.63 : x
  2. Step 2: Convert to fraction form
    121,788.63/168,068.25 = 71,487.63/x
  3. Step 3: Cross multiply
    121,788.63x = 168,068.25 × 71,487.63
  4. Step 4: Simplify right side
    121,788.63x = 12,014,800,870.75
  5. Step 5: Solve for x
    x = 12,014,800,870.75/121,788.63
  6. Step 6: Final answer
    x = 98,652.89

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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.