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Finding the Fourth Proportional to 305,787.80, 458,681.70 and 128,422.10

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Solution

The fourth proportional to 305,787.80, 458,681.70 and 128,422.10 is: 192,633.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,787.80 : 458,681.70 = 128,422.10 : x
  2. Step 2: Convert to fraction form
    305,787.80/458,681.70 = 128,422.10/x
  3. Step 3: Cross multiply
    305,787.80x = 458,681.70 × 128,422.10
  4. Step 4: Simplify right side
    305,787.80x = 58,904,867,145.57
  5. Step 5: Solve for x
    x = 58,904,867,145.57/305,787.80
  6. Step 6: Final answer
    x = 192,633.15

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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.