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Finding the Fourth Proportional to 145,756.80, 218,732.40 and 66,830.40

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Solution

The fourth proportional to 145,756.80, 218,732.40 and 66,830.40 is: 100,290.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,756.80 : 218,732.40 = 66,830.40 : x
  2. Step 2: Convert to fraction form
    145,756.80/218,732.40 = 66,830.40/x
  3. Step 3: Cross multiply
    145,756.80x = 218,732.40 × 66,830.40
  4. Step 4: Simplify right side
    145,756.80x = 14,617,973,784.96
  5. Step 5: Solve for x
    x = 14,617,973,784.96/145,756.80
  6. Step 6: Final answer
    x = 100,290.17

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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.