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Finding the Fourth Proportional to 290,307,906.80, 435,660,925.80 and 128,865,705.20

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Solution

The fourth proportional to 290,307,906.80, 435,660,925.80 and 128,865,705.20 is: 193,386,921.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,307,906.80 : 435,660,925.80 = 128,865,705.20 : x
  2. Step 2: Convert to fraction form
    290,307,906.80/435,660,925.80 = 128,865,705.20/x
  3. Step 3: Cross multiply
    290,307,906.80x = 435,660,925.80 × 128,865,705.20
  4. Step 4: Simplify right side
    290,307,906.80x = 56,141,752,431,301,880
  5. Step 5: Solve for x
    x = 56,141,752,431,301,880/290,307,906.80
  6. Step 6: Final answer
    x = 193,386,921.67

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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.