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Finding the Fourth Proportional to 103,420.90, 155,131.35 and 77,176.90

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Solution

The fourth proportional to 103,420.90, 155,131.35 and 77,176.90 is: 115,765.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,420.90 : 155,131.35 = 77,176.90 : x
  2. Step 2: Convert to fraction form
    103,420.90/155,131.35 = 77,176.90/x
  3. Step 3: Cross multiply
    103,420.90x = 155,131.35 × 77,176.90
  4. Step 4: Simplify right side
    103,420.90x = 11,972,556,685.82
  5. Step 5: Solve for x
    x = 11,972,556,685.82/103,420.90
  6. Step 6: Final answer
    x = 115,765.35

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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.