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Finding the Fourth Proportional to 72,756.64, 100,389.12 and 45,867.52

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Solution

The fourth proportional to 72,756.64, 100,389.12 and 45,867.52 is: 63,287.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,756.64 : 100,389.12 = 45,867.52 : x
  2. Step 2: Convert to fraction form
    72,756.64/100,389.12 = 45,867.52/x
  3. Step 3: Cross multiply
    72,756.64x = 100,389.12 × 45,867.52
  4. Step 4: Simplify right side
    72,756.64x = 4,604,599,969.38
  5. Step 5: Solve for x
    x = 4,604,599,969.38/72,756.64
  6. Step 6: Final answer
    x = 63,287.69

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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.