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Finding the Fourth Proportional to 78,807.81, 108,755.13 and 42,998.57

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Solution

The fourth proportional to 78,807.81, 108,755.13 and 42,998.57 is: 59,338.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,807.81 : 108,755.13 = 42,998.57 : x
  2. Step 2: Convert to fraction form
    78,807.81/108,755.13 = 42,998.57/x
  3. Step 3: Cross multiply
    78,807.81x = 108,755.13 × 42,998.57
  4. Step 4: Simplify right side
    78,807.81x = 4,676,315,070.16
  5. Step 5: Solve for x
    x = 4,676,315,070.16/78,807.81
  6. Step 6: Final answer
    x = 59,338.22

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1.5x scale

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.