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Finding the Fourth Proportional to 209,655.60, 314,521.80 and 85,009.20

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Solution

The fourth proportional to 209,655.60, 314,521.80 and 85,009.20 is: 127,529.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,655.60 : 314,521.80 = 85,009.20 : x
  2. Step 2: Convert to fraction form
    209,655.60/314,521.80 = 85,009.20/x
  3. Step 3: Cross multiply
    209,655.60x = 314,521.80 × 85,009.20
  4. Step 4: Simplify right side
    209,655.60x = 26,737,246,600.56
  5. Step 5: Solve for x
    x = 26,737,246,600.56/209,655.60
  6. Step 6: Final answer
    x = 127,529.37

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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.