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Finding the Fourth Proportional to 206,913.40, 310,341.30 and 66,686.20

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Solution

The fourth proportional to 206,913.40, 310,341.30 and 66,686.20 is: 100,020.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,913.40 : 310,341.30 = 66,686.20 : x
  2. Step 2: Convert to fraction form
    206,913.40/310,341.30 = 66,686.20/x
  3. Step 3: Cross multiply
    206,913.40x = 310,341.30 × 66,686.20
  4. Step 4: Simplify right side
    206,913.40x = 20,695,482,000.06
  5. Step 5: Solve for x
    x = 20,695,482,000.06/206,913.40
  6. Step 6: Final answer
    x = 100,020.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.