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Finding the Fourth Proportional to 318,819.85, 478,292.85 and 91,117.51

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Solution

The fourth proportional to 318,819.85, 478,292.85 and 91,117.51 is: 136,694.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,819.85 : 478,292.85 = 91,117.51 : x
  2. Step 2: Convert to fraction form
    318,819.85/478,292.85 = 91,117.51/x
  3. Step 3: Cross multiply
    318,819.85x = 478,292.85 × 91,117.51
  4. Step 4: Simplify right side
    318,819.85x = 43,580,852,347.07
  5. Step 5: Solve for x
    x = 43,580,852,347.07/318,819.85
  6. Step 6: Final answer
    x = 136,694.29

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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.