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Finding the Fourth Proportional to 478,459.90, 660,155.43 and 308,489.50

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Solution

The fourth proportional to 478,459.90, 660,155.43 and 308,489.50 is: 425,638.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,459.90 : 660,155.43 = 308,489.50 : x
  2. Step 2: Convert to fraction form
    478,459.90/660,155.43 = 308,489.50/x
  3. Step 3: Cross multiply
    478,459.90x = 660,155.43 × 308,489.50
  4. Step 4: Simplify right side
    478,459.90x = 203,651,018,522.99
  5. Step 5: Solve for x
    x = 203,651,018,522.99/478,459.90
  6. Step 6: Final answer
    x = 425,638.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.