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Finding the Fourth Proportional to 65,720.70, 98,665.79 and 56,420.48

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Solution

The fourth proportional to 65,720.70, 98,665.79 and 56,420.48 is: 84,703.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,720.70 : 98,665.79 = 56,420.48 : x
  2. Step 2: Convert to fraction form
    65,720.70/98,665.79 = 56,420.48/x
  3. Step 3: Cross multiply
    65,720.70x = 98,665.79 × 56,420.48
  4. Step 4: Simplify right side
    65,720.70x = 5,566,771,231.38
  5. Step 5: Solve for x
    x = 5,566,771,231.38/65,720.70
  6. Step 6: Final answer
    x = 84,703.47

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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.