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Finding the Fourth Proportional to 128,521.58, 192,869.58 and 45,415.58

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Solution

The fourth proportional to 128,521.58, 192,869.58 and 45,415.58 is: 68,154.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,521.58 : 192,869.58 = 45,415.58 : x
  2. Step 2: Convert to fraction form
    128,521.58/192,869.58 = 45,415.58/x
  3. Step 3: Cross multiply
    128,521.58x = 192,869.58 × 45,415.58
  4. Step 4: Simplify right side
    128,521.58x = 8,759,283,840.06
  5. Step 5: Solve for x
    x = 8,759,283,840.06/128,521.58
  6. Step 6: Final answer
    x = 68,154.19

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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.