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Finding the Fourth Proportional to 128,457,392.40, 192,630,101.40 and 51,754,928.40

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Solution

The fourth proportional to 128,457,392.40, 192,630,101.40 and 51,754,928.40 is: 77,609,835.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,457,392.40 : 192,630,101.40 = 51,754,928.40 : x
  2. Step 2: Convert to fraction form
    128,457,392.40/192,630,101.40 = 51,754,928.40/x
  3. Step 3: Cross multiply
    128,457,392.40x = 192,630,101.40 × 51,754,928.40
  4. Step 4: Simplify right side
    128,457,392.40x = 9,969,557,105,641,740
  5. Step 5: Solve for x
    x = 9,969,557,105,641,740/128,457,392.40
  6. Step 6: Final answer
    x = 77,609,835.60

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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.