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Finding the Fourth Proportional to 66,528, 91,808.76 and 36,720

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Solution

The fourth proportional to 66,528, 91,808.76 and 36,720 is: 50,673.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,528 : 91,808.76 = 36,720 : x
  2. Step 2: Convert to fraction form
    66,528/91,808.76 = 36,720/x
  3. Step 3: Cross multiply
    66,528x = 91,808.76 × 36,720
  4. Step 4: Simplify right side
    66,528x = 3,371,217,667.20
  5. Step 5: Solve for x
    x = 3,371,217,667.20/66,528
  6. Step 6: Final answer
    x = 50,673.67

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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.