Home / 129,009.24-178,031.52-72,420.21

Finding the Fourth Proportional to 129,009.24, 178,031.52 and 72,420.21

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Solution

The fourth proportional to 129,009.24, 178,031.52 and 72,420.21 is: 99,939.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,009.24 : 178,031.52 = 72,420.21 : x
  2. Step 2: Convert to fraction form
    129,009.24/178,031.52 = 72,420.21/x
  3. Step 3: Cross multiply
    129,009.24x = 178,031.52 × 72,420.21
  4. Step 4: Simplify right side
    129,009.24x = 12,893,080,065.02
  5. Step 5: Solve for x
    x = 12,893,080,065.02/129,009.24
  6. Step 6: Final answer
    x = 99,939.20

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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.