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Finding the Fourth Proportional to 91,307.70, 126,043.43 and 55,509.15

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Solution

The fourth proportional to 91,307.70, 126,043.43 and 55,509.15 is: 76,626.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,307.70 : 126,043.43 = 55,509.15 : x
  2. Step 2: Convert to fraction form
    91,307.70/126,043.43 = 55,509.15/x
  3. Step 3: Cross multiply
    91,307.70x = 126,043.43 × 55,509.15
  4. Step 4: Simplify right side
    91,307.70x = 6,996,563,384.84
  5. Step 5: Solve for x
    x = 6,996,563,384.84/91,307.70
  6. Step 6: Final answer
    x = 76,626.21

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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.