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Finding the Fourth Proportional to 212,229, 318,345.66 and 64,485

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Solution

The fourth proportional to 212,229, 318,345.66 and 64,485 is: 96,728.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,229 : 318,345.66 = 64,485 : x
  2. Step 2: Convert to fraction form
    212,229/318,345.66 = 64,485/x
  3. Step 3: Cross multiply
    212,229x = 318,345.66 × 64,485
  4. Step 4: Simplify right side
    212,229x = 20,528,519,885.10
  5. Step 5: Solve for x
    x = 20,528,519,885.10/212,229
  6. Step 6: Final answer
    x = 96,728.16

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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.