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Finding the Fourth Proportional to 305,520.45, 458,444.70 and 128,045.40

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Solution

The fourth proportional to 305,520.45, 458,444.70 and 128,045.40 is: 192,136.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,520.45 : 458,444.70 = 128,045.40 : x
  2. Step 2: Convert to fraction form
    305,520.45/458,444.70 = 128,045.40/x
  3. Step 3: Cross multiply
    305,520.45x = 458,444.70 × 128,045.40
  4. Step 4: Simplify right side
    305,520.45x = 58,701,734,989.38
  5. Step 5: Solve for x
    x = 58,701,734,989.38/305,520.45
  6. Step 6: Final answer
    x = 192,136.84

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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.