Home / 128,925.81-177,920.69-72,341.37

Finding the Fourth Proportional to 128,925.81, 177,920.69 and 72,341.37

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Solution

The fourth proportional to 128,925.81, 177,920.69 and 72,341.37 is: 99,832.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,925.81 : 177,920.69 = 72,341.37 : x
  2. Step 2: Convert to fraction form
    128,925.81/177,920.69 = 72,341.37/x
  3. Step 3: Cross multiply
    128,925.81x = 177,920.69 × 72,341.37
  4. Step 4: Simplify right side
    128,925.81x = 12,871,026,104.24
  5. Step 5: Solve for x
    x = 12,871,026,104.24/128,925.81
  6. Step 6: Final answer
    x = 99,832.81

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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.