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Finding the Fourth Proportional to 118,814.40, 178,215.12 and 39,920.40

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Solution

The fourth proportional to 118,814.40, 178,215.12 and 39,920.40 is: 59,878.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,814.40 : 178,215.12 = 39,920.40 : x
  2. Step 2: Convert to fraction form
    118,814.40/178,215.12 = 39,920.40/x
  3. Step 3: Cross multiply
    118,814.40x = 178,215.12 × 39,920.40
  4. Step 4: Simplify right side
    118,814.40x = 7,114,418,876.45
  5. Step 5: Solve for x
    x = 7,114,418,876.45/118,814.40
  6. Step 6: Final answer
    x = 59,878.42

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1.5x scale

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.