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Finding the Fourth Proportional to 128,056.80, 176,722.80 and 71,478.72

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Solution

The fourth proportional to 128,056.80, 176,722.80 and 71,478.72 is: 98,643.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,056.80 : 176,722.80 = 71,478.72 : x
  2. Step 2: Convert to fraction form
    128,056.80/176,722.80 = 71,478.72/x
  3. Step 3: Cross multiply
    128,056.80x = 176,722.80 × 71,478.72
  4. Step 4: Simplify right side
    128,056.80x = 12,631,919,538.82
  5. Step 5: Solve for x
    x = 12,631,919,538.82/128,056.80
  6. Step 6: Final answer
    x = 98,643.10

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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.