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Finding the Fourth Proportional to 56,656.40, 84,981.90 and 19,212.80

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Solution

The fourth proportional to 56,656.40, 84,981.90 and 19,212.80 is: 28,818.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,656.40 : 84,981.90 = 19,212.80 : x
  2. Step 2: Convert to fraction form
    56,656.40/84,981.90 = 19,212.80/x
  3. Step 3: Cross multiply
    56,656.40x = 84,981.90 × 19,212.80
  4. Step 4: Simplify right side
    56,656.40x = 1,632,740,248.32
  5. Step 5: Solve for x
    x = 1,632,740,248.32/56,656.40
  6. Step 6: Final answer
    x = 28,818.28

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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.