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Finding the Fourth Proportional to 290,307,894.80, 435,660,907.80 and 128,865,693.20

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Solution

The fourth proportional to 290,307,894.80, 435,660,907.80 and 128,865,693.20 is: 193,386,903.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,307,894.80 : 435,660,907.80 = 128,865,693.20 : x
  2. Step 2: Convert to fraction form
    290,307,894.80/435,660,907.80 = 128,865,693.20/x
  3. Step 3: Cross multiply
    290,307,894.80x = 435,660,907.80 × 128,865,693.20
  4. Step 4: Simplify right side
    290,307,894.80x = 56,141,744,883,788,288
  5. Step 5: Solve for x
    x = 56,141,744,883,788,288/290,307,894.80
  6. Step 6: Final answer
    x = 193,386,903.66

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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.