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Finding the Fourth Proportional to 353,909.70, 530,864.55 and 221,199.30

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Solution

The fourth proportional to 353,909.70, 530,864.55 and 221,199.30 is: 331,798.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    353,909.70 : 530,864.55 = 221,199.30 : x
  2. Step 2: Convert to fraction form
    353,909.70/530,864.55 = 221,199.30/x
  3. Step 3: Cross multiply
    353,909.70x = 530,864.55 × 221,199.30
  4. Step 4: Simplify right side
    353,909.70x = 117,426,866,854.82
  5. Step 5: Solve for x
    x = 117,426,866,854.82/353,909.70
  6. Step 6: Final answer
    x = 331,798.95

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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.