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Finding the Fourth Proportional to 72,654.40, 108,981.60 and 64,820.80

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Solution

The fourth proportional to 72,654.40, 108,981.60 and 64,820.80 is: 97,231.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,654.40 : 108,981.60 = 64,820.80 : x
  2. Step 2: Convert to fraction form
    72,654.40/108,981.60 = 64,820.80/x
  3. Step 3: Cross multiply
    72,654.40x = 108,981.60 × 64,820.80
  4. Step 4: Simplify right side
    72,654.40x = 7,064,274,497.28
  5. Step 5: Solve for x
    x = 7,064,274,497.28/72,654.40
  6. Step 6: Final answer
    x = 97,231.20

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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.