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Finding the Fourth Proportional to 64,986.80, 97,480.20 and 42,825.20

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Solution

The fourth proportional to 64,986.80, 97,480.20 and 42,825.20 is: 64,237.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,986.80 : 97,480.20 = 42,825.20 : x
  2. Step 2: Convert to fraction form
    64,986.80/97,480.20 = 42,825.20/x
  3. Step 3: Cross multiply
    64,986.80x = 97,480.20 × 42,825.20
  4. Step 4: Simplify right side
    64,986.80x = 4,174,609,061.04
  5. Step 5: Solve for x
    x = 4,174,609,061.04/64,986.80
  6. Step 6: Final answer
    x = 64,237.80

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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.