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Finding the Fourth Proportional to 427,143.60, 640,666.80 and 111,632.40

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Solution

The fourth proportional to 427,143.60, 640,666.80 and 111,632.40 is: 167,435.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,143.60 : 640,666.80 = 111,632.40 : x
  2. Step 2: Convert to fraction form
    427,143.60/640,666.80 = 111,632.40/x
  3. Step 3: Cross multiply
    427,143.60x = 640,666.80 × 111,632.40
  4. Step 4: Simplify right side
    427,143.60x = 71,519,172,484.32
  5. Step 5: Solve for x
    x = 71,519,172,484.32/427,143.60
  6. Step 6: Final answer
    x = 167,435.90

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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.