Home / 128,988.19-178,003.70-72,417.79

Finding the Fourth Proportional to 128,988.19, 178,003.70 and 72,417.79

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Solution

The fourth proportional to 128,988.19, 178,003.70 and 72,417.79 is: 99,936.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,988.19 : 178,003.70 = 72,417.79 : x
  2. Step 2: Convert to fraction form
    128,988.19/178,003.70 = 72,417.79/x
  3. Step 3: Cross multiply
    128,988.19x = 178,003.70 × 72,417.79
  4. Step 4: Simplify right side
    128,988.19x = 12,890,634,301.86
  5. Step 5: Solve for x
    x = 12,890,634,301.86/128,988.19
  6. Step 6: Final answer
    x = 99,936.55

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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.