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Finding the Fourth Proportional to 127,981.60, 191,970.60 and 57,860.80

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Solution

The fourth proportional to 127,981.60, 191,970.60 and 57,860.80 is: 86,790.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,981.60 : 191,970.60 = 57,860.80 : x
  2. Step 2: Convert to fraction form
    127,981.60/191,970.60 = 57,860.80/x
  3. Step 3: Cross multiply
    127,981.60x = 191,970.60 × 57,860.80
  4. Step 4: Simplify right side
    127,981.60x = 11,107,572,492.48
  5. Step 5: Solve for x
    x = 11,107,572,492.48/127,981.60
  6. Step 6: Final answer
    x = 86,790.39

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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.