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Finding the Fourth Proportional to 64,539.60, 96,809.40 and 42,421.20

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Solution

The fourth proportional to 64,539.60, 96,809.40 and 42,421.20 is: 63,631.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,539.60 : 96,809.40 = 42,421.20 : x
  2. Step 2: Convert to fraction form
    64,539.60/96,809.40 = 42,421.20/x
  3. Step 3: Cross multiply
    64,539.60x = 96,809.40 × 42,421.20
  4. Step 4: Simplify right side
    64,539.60x = 4,106,770,919.28
  5. Step 5: Solve for x
    x = 4,106,770,919.28/64,539.60
  6. Step 6: Final answer
    x = 63,631.80

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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.