Home / 128,575.68-177,434.40-72,000.32

Finding the Fourth Proportional to 128,575.68, 177,434.40 and 72,000.32

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Solution

The fourth proportional to 128,575.68, 177,434.40 and 72,000.32 is: 99,360.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,575.68 : 177,434.40 = 72,000.32 : x
  2. Step 2: Convert to fraction form
    128,575.68/177,434.40 = 72,000.32/x
  3. Step 3: Cross multiply
    128,575.68x = 177,434.40 × 72,000.32
  4. Step 4: Simplify right side
    128,575.68x = 12,775,333,579.01
  5. Step 5: Solve for x
    x = 12,775,333,579.01/128,575.68
  6. Step 6: Final answer
    x = 99,360.42

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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.