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Finding the Fourth Proportional to 212,636.86, 318,957.72 and 91,041.01

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Solution

The fourth proportional to 212,636.86, 318,957.72 and 91,041.01 is: 136,562.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,636.86 : 318,957.72 = 91,041.01 : x
  2. Step 2: Convert to fraction form
    212,636.86/318,957.72 = 91,041.01/x
  3. Step 3: Cross multiply
    212,636.86x = 318,957.72 × 91,041.01
  4. Step 4: Simplify right side
    212,636.86x = 29,038,232,976.10
  5. Step 5: Solve for x
    x = 29,038,232,976.10/212,636.86
  6. Step 6: Final answer
    x = 136,562.56

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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.