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Finding the Fourth Proportional to 445,409.70, 668,114.55 and 129,876.90

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Solution

The fourth proportional to 445,409.70, 668,114.55 and 129,876.90 is: 194,815.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,409.70 : 668,114.55 = 129,876.90 : x
  2. Step 2: Convert to fraction form
    445,409.70/668,114.55 = 129,876.90/x
  3. Step 3: Cross multiply
    445,409.70x = 668,114.55 × 129,876.90
  4. Step 4: Simplify right side
    445,409.70x = 86,772,646,598.90
  5. Step 5: Solve for x
    x = 86,772,646,598.90/445,409.70
  6. Step 6: Final answer
    x = 194,815.35

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Similar ratio
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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.