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Finding the Fourth Proportional to 318,820.41, 478,293.71 and 91,118.07

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Solution

The fourth proportional to 318,820.41, 478,293.71 and 91,118.07 is: 136,695.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,820.41 : 478,293.71 = 91,118.07 : x
  2. Step 2: Convert to fraction form
    318,820.41/478,293.71 = 91,118.07/x
  3. Step 3: Cross multiply
    318,820.41x = 478,293.71 × 91,118.07
  4. Step 4: Simplify right side
    318,820.41x = 43,581,199,292.75
  5. Step 5: Solve for x
    x = 43,581,199,292.75/318,820.41
  6. Step 6: Final answer
    x = 136,695.14

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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.