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Finding the Fourth Proportional to 74,890.80, 112,005.72 and 66,628.80

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Solution

The fourth proportional to 74,890.80, 112,005.72 and 66,628.80 is: 99,649.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,890.80 : 112,005.72 = 66,628.80 : x
  2. Step 2: Convert to fraction form
    74,890.80/112,005.72 = 66,628.80/x
  3. Step 3: Cross multiply
    74,890.80x = 112,005.72 × 66,628.80
  4. Step 4: Simplify right side
    74,890.80x = 7,462,806,716.74
  5. Step 5: Solve for x
    x = 7,462,806,716.74/74,890.80
  6. Step 6: Final answer
    x = 99,649.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.