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Finding the Fourth Proportional to 121,810.34, 168,036.72 and 81,525.80

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Solution

The fourth proportional to 121,810.34, 168,036.72 and 81,525.80 is: 112,464.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,810.34 : 168,036.72 = 81,525.80 : x
  2. Step 2: Convert to fraction form
    121,810.34/168,036.72 = 81,525.80/x
  3. Step 3: Cross multiply
    121,810.34x = 168,036.72 × 81,525.80
  4. Step 4: Simplify right side
    121,810.34x = 13,699,328,027.38
  5. Step 5: Solve for x
    x = 13,699,328,027.38/121,810.34
  6. Step 6: Final answer
    x = 112,464.41

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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.