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Finding the Fourth Proportional to 78,005.60, 117,008.40 and 64,008.80

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Solution

The fourth proportional to 78,005.60, 117,008.40 and 64,008.80 is: 96,013.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,005.60 : 117,008.40 = 64,008.80 : x
  2. Step 2: Convert to fraction form
    78,005.60/117,008.40 = 64,008.80/x
  3. Step 3: Cross multiply
    78,005.60x = 117,008.40 × 64,008.80
  4. Step 4: Simplify right side
    78,005.60x = 7,489,567,273.92
  5. Step 5: Solve for x
    x = 7,489,567,273.92/78,005.60
  6. Step 6: Final answer
    x = 96,013.20

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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.