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Finding the Fourth Proportional to 209,981.70, 314,972.55 and 126,000.90

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Solution

The fourth proportional to 209,981.70, 314,972.55 and 126,000.90 is: 189,001.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,981.70 : 314,972.55 = 126,000.90 : x
  2. Step 2: Convert to fraction form
    209,981.70/314,972.55 = 126,000.90/x
  3. Step 3: Cross multiply
    209,981.70x = 314,972.55 × 126,000.90
  4. Step 4: Simplify right side
    209,981.70x = 39,686,824,775.30
  5. Step 5: Solve for x
    x = 39,686,824,775.30/209,981.70
  6. Step 6: Final answer
    x = 189,001.35

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1.5x scale

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.