Home / 128,031.20-176,665.40-71,431.60

Finding the Fourth Proportional to 128,031.20, 176,665.40 and 71,431.60

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Solution

The fourth proportional to 128,031.20, 176,665.40 and 71,431.60 is: 98,565.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,031.20 : 176,665.40 = 71,431.60 : x
  2. Step 2: Convert to fraction form
    128,031.20/176,665.40 = 71,431.60/x
  3. Step 3: Cross multiply
    128,031.20x = 176,665.40 × 71,431.60
  4. Step 4: Simplify right side
    128,031.20x = 12,619,492,186.64
  5. Step 5: Solve for x
    x = 12,619,492,186.64/128,031.20
  6. Step 6: Final answer
    x = 98,565.76

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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.