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Finding the Fourth Proportional to 64,820.80, 97,231.20 and 56,785.60

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Solution

The fourth proportional to 64,820.80, 97,231.20 and 56,785.60 is: 85,178.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,820.80 : 97,231.20 = 56,785.60 : x
  2. Step 2: Convert to fraction form
    64,820.80/97,231.20 = 56,785.60/x
  3. Step 3: Cross multiply
    64,820.80x = 97,231.20 × 56,785.60
  4. Step 4: Simplify right side
    64,820.80x = 5,521,332,030.72
  5. Step 5: Solve for x
    x = 5,521,332,030.72/64,820.80
  6. Step 6: Final answer
    x = 85,178.40

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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.