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Finding the Fourth Proportional to 100,980.66, 139,353.98 and 57,948.68

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Solution

The fourth proportional to 100,980.66, 139,353.98 and 57,948.68 is: 79,969.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,980.66 : 139,353.98 = 57,948.68 : x
  2. Step 2: Convert to fraction form
    100,980.66/139,353.98 = 57,948.68/x
  3. Step 3: Cross multiply
    100,980.66x = 139,353.98 × 57,948.68
  4. Step 4: Simplify right side
    100,980.66x = 8,075,378,207.23
  5. Step 5: Solve for x
    x = 8,075,378,207.23/100,980.66
  6. Step 6: Final answer
    x = 79,969.55

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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.