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Finding the Fourth Proportional to 91,173, 125,818.90 and 51,429

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Solution

The fourth proportional to 91,173, 125,818.90 and 51,429 is: 70,972.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,173 : 125,818.90 = 51,429 : x
  2. Step 2: Convert to fraction form
    91,173/125,818.90 = 51,429/x
  3. Step 3: Cross multiply
    91,173x = 125,818.90 × 51,429
  4. Step 4: Simplify right side
    91,173x = 6,470,740,208.10
  5. Step 5: Solve for x
    x = 6,470,740,208.10/91,173
  6. Step 6: Final answer
    x = 70,972.11

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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.