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Finding the Fourth Proportional to 291,638,578.40, 437,457,867.60 and 287,103,615.20

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Solution

The fourth proportional to 291,638,578.40, 437,457,867.60 and 287,103,615.20 is: 430,655,422.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,638,578.40 : 437,457,867.60 = 287,103,615.20 : x
  2. Step 2: Convert to fraction form
    291,638,578.40/437,457,867.60 = 287,103,615.20/x
  3. Step 3: Cross multiply
    291,638,578.40x = 437,457,867.60 × 287,103,615.20
  4. Step 4: Simplify right side
    291,638,578.40x = 125,595,735,285,642,944
  5. Step 5: Solve for x
    x = 125,595,735,285,642,944/291,638,578.40
  6. Step 6: Final answer
    x = 430,655,422.80

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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.