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Finding the Fourth Proportional to 92,796, 128,058.76 and 56,985.64

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Solution

The fourth proportional to 92,796, 128,058.76 and 56,985.64 is: 78,640.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,796 : 128,058.76 = 56,985.64 : x
  2. Step 2: Convert to fraction form
    92,796/128,058.76 = 56,985.64/x
  3. Step 3: Cross multiply
    92,796x = 128,058.76 × 56,985.64
  4. Step 4: Simplify right side
    92,796x = 7,297,510,396.21
  5. Step 5: Solve for x
    x = 7,297,510,396.21/92,796
  6. Step 6: Final answer
    x = 78,640.36

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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.