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Finding the Fourth Proportional to 139,968,124.40, 209,952,186.60 and 128,882,658.80

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Solution

The fourth proportional to 139,968,124.40, 209,952,186.60 and 128,882,658.80 is: 193,323,988.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968,124.40 : 209,952,186.60 = 128,882,658.80 : x
  2. Step 2: Convert to fraction form
    139,968,124.40/209,952,186.60 = 128,882,658.80/x
  3. Step 3: Cross multiply
    139,968,124.40x = 209,952,186.60 × 128,882,658.80
  4. Step 4: Simplify right side
    139,968,124.40x = 27,059,196,029,881,732
  5. Step 5: Solve for x
    x = 27,059,196,029,881,732/139,968,124.40
  6. Step 6: Final answer
    x = 193,323,988.20

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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.