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Finding the Fourth Proportional to 112,860.61, 155,620.10 and 71,970.09

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Solution

The fourth proportional to 112,860.61, 155,620.10 and 71,970.09 is: 99,237.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,860.61 : 155,620.10 = 71,970.09 : x
  2. Step 2: Convert to fraction form
    112,860.61/155,620.10 = 71,970.09/x
  3. Step 3: Cross multiply
    112,860.61x = 155,620.10 × 71,970.09
  4. Step 4: Simplify right side
    112,860.61x = 11,199,991,853.91
  5. Step 5: Solve for x
    x = 11,199,991,853.91/112,860.61
  6. Step 6: Final answer
    x = 99,237.39

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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.