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Finding the Fourth Proportional to 64,620.71, 96,978.45 and 42,426.30

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Solution

The fourth proportional to 64,620.71, 96,978.45 and 42,426.30 is: 63,670.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,620.71 : 96,978.45 = 42,426.30 : x
  2. Step 2: Convert to fraction form
    64,620.71/96,978.45 = 42,426.30/x
  3. Step 3: Cross multiply
    64,620.71x = 96,978.45 × 42,426.30
  4. Step 4: Simplify right side
    64,620.71x = 4,114,436,813.24
  5. Step 5: Solve for x
    x = 4,114,436,813.24/64,620.71
  6. Step 6: Final answer
    x = 63,670.57

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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.