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Finding the Fourth Proportional to 56,421.72, 84,621.56 and 21,364.11

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Solution

The fourth proportional to 56,421.72, 84,621.56 and 21,364.11 is: 32,041.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,421.72 : 84,621.56 = 21,364.11 : x
  2. Step 2: Convert to fraction form
    56,421.72/84,621.56 = 21,364.11/x
  3. Step 3: Cross multiply
    56,421.72x = 84,621.56 × 21,364.11
  4. Step 4: Simplify right side
    56,421.72x = 1,807,864,209.39
  5. Step 5: Solve for x
    x = 1,807,864,209.39/56,421.72
  6. Step 6: Final answer
    x = 32,041.99

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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.