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Finding the Fourth Proportional to 212,011.34, 317,892.47 and 85,655.60

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Solution

The fourth proportional to 212,011.34, 317,892.47 and 85,655.60 is: 128,433.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,011.34 : 317,892.47 = 85,655.60 : x
  2. Step 2: Convert to fraction form
    212,011.34/317,892.47 = 85,655.60/x
  3. Step 3: Cross multiply
    212,011.34x = 317,892.47 × 85,655.60
  4. Step 4: Simplify right side
    212,011.34x = 27,229,268,235.59
  5. Step 5: Solve for x
    x = 27,229,268,235.59/212,011.34
  6. Step 6: Final answer
    x = 128,433.08

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1.5x scale

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.