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Finding the Fourth Proportional to 92,820, 128,090.88 and 50,378.64

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Solution

The fourth proportional to 92,820, 128,090.88 and 50,378.64 is: 69,522.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,820 : 128,090.88 = 50,378.64 : x
  2. Step 2: Convert to fraction form
    92,820/128,090.88 = 50,378.64/x
  3. Step 3: Cross multiply
    92,820x = 128,090.88 × 50,378.64
  4. Step 4: Simplify right side
    92,820x = 6,453,044,330.80
  5. Step 5: Solve for x
    x = 6,453,044,330.80/92,820
  6. Step 6: Final answer
    x = 69,522.13

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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.