Home / 128,488.12-177,315.96-71,899.36

Finding the Fourth Proportional to 128,488.12, 177,315.96 and 71,899.36

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Solution

The fourth proportional to 128,488.12, 177,315.96 and 71,899.36 is: 99,222.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,488.12 : 177,315.96 = 71,899.36 : x
  2. Step 2: Convert to fraction form
    128,488.12/177,315.96 = 71,899.36/x
  3. Step 3: Cross multiply
    128,488.12x = 177,315.96 × 71,899.36
  4. Step 4: Simplify right side
    128,488.12x = 12,748,904,041.79
  5. Step 5: Solve for x
    x = 12,748,904,041.79/128,488.12
  6. Step 6: Final answer
    x = 99,222.43

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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.