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Finding the Fourth Proportional to 620,658.60, 930,769.20 and 221,312.40

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Solution

The fourth proportional to 620,658.60, 930,769.20 and 221,312.40 is: 331,890.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,658.60 : 930,769.20 = 221,312.40 : x
  2. Step 2: Convert to fraction form
    620,658.60/930,769.20 = 221,312.40/x
  3. Step 3: Cross multiply
    620,658.60x = 930,769.20 × 221,312.40
  4. Step 4: Simplify right side
    620,658.60x = 205,990,765,498.08
  5. Step 5: Solve for x
    x = 205,990,765,498.08/620,658.60
  6. Step 6: Final answer
    x = 331,890.62

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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.