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Finding the Fourth Proportional to 212,139.01, 318,296.63 and 85,868.52

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Solution

The fourth proportional to 212,139.01, 318,296.63 and 85,868.52 is: 128,838.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,139.01 : 318,296.63 = 85,868.52 : x
  2. Step 2: Convert to fraction form
    212,139.01/318,296.63 = 85,868.52/x
  3. Step 3: Cross multiply
    212,139.01x = 318,296.63 × 85,868.52
  4. Step 4: Simplify right side
    212,139.01x = 27,331,660,539.09
  5. Step 5: Solve for x
    x = 27,331,660,539.09/212,139.01
  6. Step 6: Final answer
    x = 128,838.45

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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.