Home / 128,709.23-177,421.85-90,361.20

Finding the Fourth Proportional to 128,709.23, 177,421.85 and 90,361.20

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Solution

The fourth proportional to 128,709.23, 177,421.85 and 90,361.20 is: 124,560.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,709.23 : 177,421.85 = 90,361.20 : x
  2. Step 2: Convert to fraction form
    128,709.23/177,421.85 = 90,361.20/x
  3. Step 3: Cross multiply
    128,709.23x = 177,421.85 × 90,361.20
  4. Step 4: Simplify right side
    128,709.23x = 16,032,051,272.22
  5. Step 5: Solve for x
    x = 16,032,051,272.22/128,709.23
  6. Step 6: Final answer
    x = 124,560.23

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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.