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Finding the Fourth Proportional to 129,486.60, 178,690.86 and 72,898.38

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Solution

The fourth proportional to 129,486.60, 178,690.86 and 72,898.38 is: 100,599.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,486.60 : 178,690.86 = 72,898.38 : x
  2. Step 2: Convert to fraction form
    129,486.60/178,690.86 = 72,898.38/x
  3. Step 3: Cross multiply
    129,486.60x = 178,690.86 × 72,898.38
  4. Step 4: Simplify right side
    129,486.60x = 13,026,274,214.81
  5. Step 5: Solve for x
    x = 13,026,274,214.81/129,486.60
  6. Step 6: Final answer
    x = 100,599.40

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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.