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Finding the Fourth Proportional to 66,402,403.80, 99,603,605.70 and 20,958,293.40

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Solution

The fourth proportional to 66,402,403.80, 99,603,605.70 and 20,958,293.40 is: 31,437,440.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,402,403.80 : 99,603,605.70 = 20,958,293.40 : x
  2. Step 2: Convert to fraction form
    66,402,403.80/99,603,605.70 = 20,958,293.40/x
  3. Step 3: Cross multiply
    66,402,403.80x = 99,603,605.70 × 20,958,293.40
  4. Step 4: Simplify right side
    66,402,403.80x = 2,087,521,591,958,512.25
  5. Step 5: Solve for x
    x = 2,087,521,591,958,512.25/66,402,403.80
  6. Step 6: Final answer
    x = 31,437,440.10

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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.