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Finding the Fourth Proportional to 386,416.40, 579,624.60 and 137,123.60

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Solution

The fourth proportional to 386,416.40, 579,624.60 and 137,123.60 is: 205,685.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,416.40 : 579,624.60 = 137,123.60 : x
  2. Step 2: Convert to fraction form
    386,416.40/579,624.60 = 137,123.60/x
  3. Step 3: Cross multiply
    386,416.40x = 579,624.60 × 137,123.60
  4. Step 4: Simplify right side
    386,416.40x = 79,480,211,800.56
  5. Step 5: Solve for x
    x = 79,480,211,800.56/386,416.40
  6. Step 6: Final answer
    x = 205,685.40

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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.