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Finding the Fourth Proportional to 280,205,987.60, 420,308,981.40 and 280,205,987.60

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Solution

The fourth proportional to 280,205,987.60, 420,308,981.40 and 280,205,987.60 is: 420,308,981.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,205,987.60 : 420,308,981.40 = 280,205,987.60 : x
  2. Step 2: Convert to fraction form
    280,205,987.60/420,308,981.40 = 280,205,987.60/x
  3. Step 3: Cross multiply
    280,205,987.60x = 420,308,981.40 × 280,205,987.60
  4. Step 4: Simplify right side
    280,205,987.60x = 117,773,093,230,337,040
  5. Step 5: Solve for x
    x = 117,773,093,230,337,040/280,205,987.60
  6. Step 6: Final answer
    x = 420,308,981.40

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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.