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Finding the Fourth Proportional to 402,407.60, 603,611.40 and 121,938.80

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Solution

The fourth proportional to 402,407.60, 603,611.40 and 121,938.80 is: 182,908.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,407.60 : 603,611.40 = 121,938.80 : x
  2. Step 2: Convert to fraction form
    402,407.60/603,611.40 = 121,938.80/x
  3. Step 3: Cross multiply
    402,407.60x = 603,611.40 × 121,938.80
  4. Step 4: Simplify right side
    402,407.60x = 73,603,649,782.32
  5. Step 5: Solve for x
    x = 73,603,649,782.32/402,407.60
  6. Step 6: Final answer
    x = 182,908.20

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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.