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Finding the Fourth Proportional to 56,693.76, 85,012.80 and 21,153.72

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Solution

The fourth proportional to 56,693.76, 85,012.80 and 21,153.72 is: 31,720.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,693.76 : 85,012.80 = 21,153.72 : x
  2. Step 2: Convert to fraction form
    56,693.76/85,012.80 = 21,153.72/x
  3. Step 3: Cross multiply
    56,693.76x = 85,012.80 × 21,153.72
  4. Step 4: Simplify right side
    56,693.76x = 1,798,336,967.62
  5. Step 5: Solve for x
    x = 1,798,336,967.62/56,693.76
  6. Step 6: Final answer
    x = 31,720.19

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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.