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Finding the Fourth Proportional to 103,420.40, 155,130.60 and 77,176.40

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Solution

The fourth proportional to 103,420.40, 155,130.60 and 77,176.40 is: 115,764.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,420.40 : 155,130.60 = 77,176.40 : x
  2. Step 2: Convert to fraction form
    103,420.40/155,130.60 = 77,176.40/x
  3. Step 3: Cross multiply
    103,420.40x = 155,130.60 × 77,176.40
  4. Step 4: Simplify right side
    103,420.40x = 11,972,421,237.84
  5. Step 5: Solve for x
    x = 11,972,421,237.84/103,420.40
  6. Step 6: Final answer
    x = 115,764.60

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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.