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Finding the Fourth Proportional to 79,316.40, 109,465.78 and 47,485.28

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Solution

The fourth proportional to 79,316.40, 109,465.78 and 47,485.28 is: 65,535.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,316.40 : 109,465.78 = 47,485.28 : x
  2. Step 2: Convert to fraction form
    79,316.40/109,465.78 = 47,485.28/x
  3. Step 3: Cross multiply
    79,316.40x = 109,465.78 × 47,485.28
  4. Step 4: Simplify right side
    79,316.40x = 5,198,013,213.72
  5. Step 5: Solve for x
    x = 5,198,013,213.72/79,316.40
  6. Step 6: Final answer
    x = 65,535.16

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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.