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Finding the Fourth Proportional to 56,991.66, 78,670.44 and 51,012.78

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Solution

The fourth proportional to 56,991.66, 78,670.44 and 51,012.78 is: 70,417.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,991.66 : 78,670.44 = 51,012.78 : x
  2. Step 2: Convert to fraction form
    56,991.66/78,670.44 = 51,012.78/x
  3. Step 3: Cross multiply
    56,991.66x = 78,670.44 × 51,012.78
  4. Step 4: Simplify right side
    56,991.66x = 4,013,197,848.22
  5. Step 5: Solve for x
    x = 4,013,197,848.22/56,991.66
  6. Step 6: Final answer
    x = 70,417.28

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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.