Home / 128,764.65-177,685.54-72,165.09

Finding the Fourth Proportional to 128,764.65, 177,685.54 and 72,165.09

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Solution

The fourth proportional to 128,764.65, 177,685.54 and 72,165.09 is: 99,582.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,764.65 : 177,685.54 = 72,165.09 : x
  2. Step 2: Convert to fraction form
    128,764.65/177,685.54 = 72,165.09/x
  3. Step 3: Cross multiply
    128,764.65x = 177,685.54 × 72,165.09
  4. Step 4: Simplify right side
    128,764.65x = 12,822,692,985.80
  5. Step 5: Solve for x
    x = 12,822,692,985.80/128,764.65
  6. Step 6: Final answer
    x = 99,582.40

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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.