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Finding the Fourth Proportional to 100,753, 139,042.40 and 55,428.64

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Solution

The fourth proportional to 100,753, 139,042.40 and 55,428.64 is: 76,493.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,753 : 139,042.40 = 55,428.64 : x
  2. Step 2: Convert to fraction form
    100,753/139,042.40 = 55,428.64/x
  3. Step 3: Cross multiply
    100,753x = 139,042.40 × 55,428.64
  4. Step 4: Simplify right side
    100,753x = 7,706,931,134.34
  5. Step 5: Solve for x
    x = 7,706,931,134.34/100,753
  6. Step 6: Final answer
    x = 76,493.32

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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.