Home / 56,621.36-78,138.48-31,128.80

Finding the Fourth Proportional to 56,621.36, 78,138.48 and 31,128.80

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Solution

The fourth proportional to 56,621.36, 78,138.48 and 31,128.80 is: 42,958.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,621.36 : 78,138.48 = 31,128.80 : x
  2. Step 2: Convert to fraction form
    56,621.36/78,138.48 = 31,128.80/x
  3. Step 3: Cross multiply
    56,621.36x = 78,138.48 × 31,128.80
  4. Step 4: Simplify right side
    56,621.36x = 2,432,357,116.22
  5. Step 5: Solve for x
    x = 2,432,357,116.22/56,621.36
  6. Step 6: Final answer
    x = 42,958.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.