Home / 129,357.79-178,518.89-71,999.51

Finding the Fourth Proportional to 129,357.79, 178,518.89 and 71,999.51

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Solution

The fourth proportional to 129,357.79, 178,518.89 and 71,999.51 is: 99,362.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,357.79 : 178,518.89 = 71,999.51 : x
  2. Step 2: Convert to fraction form
    129,357.79/178,518.89 = 71,999.51/x
  3. Step 3: Cross multiply
    129,357.79x = 178,518.89 × 71,999.51
  4. Step 4: Simplify right side
    129,357.79x = 12,853,271,893.15
  5. Step 5: Solve for x
    x = 12,853,271,893.15/129,357.79
  6. Step 6: Final answer
    x = 99,362.18

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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.