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Finding the Fourth Proportional to 145,720.80, 218,516.40 and 66,859.20

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Solution

The fourth proportional to 145,720.80, 218,516.40 and 66,859.20 is: 100,259.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,720.80 : 218,516.40 = 66,859.20 : x
  2. Step 2: Convert to fraction form
    145,720.80/218,516.40 = 66,859.20/x
  3. Step 3: Cross multiply
    145,720.80x = 218,516.40 × 66,859.20
  4. Step 4: Simplify right side
    145,720.80x = 14,609,831,690.88
  5. Step 5: Solve for x
    x = 14,609,831,690.88/145,720.80
  6. Step 6: Final answer
    x = 100,259.07

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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.