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Finding the Fourth Proportional to 305,638.16, 421,805.64 and 169,680.40

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Solution

The fourth proportional to 305,638.16, 421,805.64 and 169,680.40 is: 234,172.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,638.16 : 421,805.64 = 169,680.40 : x
  2. Step 2: Convert to fraction form
    305,638.16/421,805.64 = 169,680.40/x
  3. Step 3: Cross multiply
    305,638.16x = 421,805.64 × 169,680.40
  4. Step 4: Simplify right side
    305,638.16x = 71,572,149,717.46
  5. Step 5: Solve for x
    x = 71,572,149,717.46/305,638.16
  6. Step 6: Final answer
    x = 234,172.82

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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.