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Finding the Fourth Proportional to 305,818.71, 458,705.39 and 128,318.55

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Solution

The fourth proportional to 305,818.71, 458,705.39 and 128,318.55 is: 192,468.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,818.71 : 458,705.39 = 128,318.55 : x
  2. Step 2: Convert to fraction form
    305,818.71/458,705.39 = 128,318.55/x
  3. Step 3: Cross multiply
    305,818.71x = 458,705.39 × 128,318.55
  4. Step 4: Simplify right side
    305,818.71x = 58,860,409,880.39
  5. Step 5: Solve for x
    x = 58,860,409,880.39/305,818.71
  6. Step 6: Final answer
    x = 192,468.31

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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.