Home / 128,946.24-177,964.80-78,674.40

Finding the Fourth Proportional to 128,946.24, 177,964.80 and 78,674.40

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Solution

The fourth proportional to 128,946.24, 177,964.80 and 78,674.40 is: 108,582.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,946.24 : 177,964.80 = 78,674.40 : x
  2. Step 2: Convert to fraction form
    128,946.24/177,964.80 = 78,674.40/x
  3. Step 3: Cross multiply
    128,946.24x = 177,964.80 × 78,674.40
  4. Step 4: Simplify right side
    128,946.24x = 14,001,273,861.12
  5. Step 5: Solve for x
    x = 14,001,273,861.12/128,946.24
  6. Step 6: Final answer
    x = 108,582.26

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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.