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Finding the Fourth Proportional to 78,830.70, 118,246.05 and 67,020.90

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Solution

The fourth proportional to 78,830.70, 118,246.05 and 67,020.90 is: 100,531.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,830.70 : 118,246.05 = 67,020.90 : x
  2. Step 2: Convert to fraction form
    78,830.70/118,246.05 = 67,020.90/x
  3. Step 3: Cross multiply
    78,830.70x = 118,246.05 × 67,020.90
  4. Step 4: Simplify right side
    78,830.70x = 7,924,956,692.45
  5. Step 5: Solve for x
    x = 7,924,956,692.45/78,830.70
  6. Step 6: Final answer
    x = 100,531.35

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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.