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Finding the Fourth Proportional to 137,254.80, 205,709.40 and 121,702.80

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Solution

The fourth proportional to 137,254.80, 205,709.40 and 121,702.80 is: 182,400.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,254.80 : 205,709.40 = 121,702.80 : x
  2. Step 2: Convert to fraction form
    137,254.80/205,709.40 = 121,702.80/x
  3. Step 3: Cross multiply
    137,254.80x = 205,709.40 × 121,702.80
  4. Step 4: Simplify right side
    137,254.80x = 25,035,409,966.32
  5. Step 5: Solve for x
    x = 25,035,409,966.32/137,254.80
  6. Step 6: Final answer
    x = 182,400.98

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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.