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Finding the Fourth Proportional to 318,689.64, 478,050.36 and 91,019.04

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Solution

The fourth proportional to 318,689.64, 478,050.36 and 91,019.04 is: 136,533.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,689.64 : 478,050.36 = 91,019.04 : x
  2. Step 2: Convert to fraction form
    318,689.64/478,050.36 = 91,019.04/x
  3. Step 3: Cross multiply
    318,689.64x = 478,050.36 × 91,019.04
  4. Step 4: Simplify right side
    318,689.64x = 43,511,684,838.85
  5. Step 5: Solve for x
    x = 43,511,684,838.85/318,689.64
  6. Step 6: Final answer
    x = 136,533.10

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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.