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Finding the Fourth Proportional to 91,980, 126,931.32 and 51,700.59

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Solution

The fourth proportional to 91,980, 126,931.32 and 51,700.59 is: 71,346.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,980 : 126,931.32 = 51,700.59 : x
  2. Step 2: Convert to fraction form
    91,980/126,931.32 = 51,700.59/x
  3. Step 3: Cross multiply
    91,980x = 126,931.32 × 51,700.59
  4. Step 4: Simplify right side
    91,980x = 6,562,424,133.48
  5. Step 5: Solve for x
    x = 6,562,424,133.48/91,980
  6. Step 6: Final answer
    x = 71,346.21

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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.