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Finding the Fourth Proportional to 78,577.60, 117,866.40 and 19,412.80

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Solution

The fourth proportional to 78,577.60, 117,866.40 and 19,412.80 is: 29,119.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,577.60 : 117,866.40 = 19,412.80 : x
  2. Step 2: Convert to fraction form
    78,577.60/117,866.40 = 19,412.80/x
  3. Step 3: Cross multiply
    78,577.60x = 117,866.40 × 19,412.80
  4. Step 4: Simplify right side
    78,577.60x = 2,288,116,849.92
  5. Step 5: Solve for x
    x = 2,288,116,849.92/78,577.60
  6. Step 6: Final answer
    x = 29,119.20

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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.