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Finding the Fourth Proportional to 128,225.84, 176,921.34 and 74,478.92

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Solution

The fourth proportional to 128,225.84, 176,921.34 and 74,478.92 is: 102,763.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,225.84 : 176,921.34 = 74,478.92 : x
  2. Step 2: Convert to fraction form
    128,225.84/176,921.34 = 74,478.92/x
  3. Step 3: Cross multiply
    128,225.84x = 176,921.34 × 74,478.92
  4. Step 4: Simplify right side
    128,225.84x = 13,176,910,328.15
  5. Step 5: Solve for x
    x = 13,176,910,328.15/128,225.84
  6. Step 6: Final answer
    x = 102,763.30

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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.