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Finding the Fourth Proportional to 78,899.80, 118,119.30 and 70,605.40

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Solution

The fourth proportional to 78,899.80, 118,119.30 and 70,605.40 is: 105,701.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,899.80 : 118,119.30 = 70,605.40 : x
  2. Step 2: Convert to fraction form
    78,899.80/118,119.30 = 70,605.40/x
  3. Step 3: Cross multiply
    78,899.80x = 118,119.30 × 70,605.40
  4. Step 4: Simplify right side
    78,899.80x = 8,339,860,424.22
  5. Step 5: Solve for x
    x = 8,339,860,424.22/78,899.80
  6. Step 6: Final answer
    x = 105,701.92

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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.