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Finding the Fourth Proportional to 219,814.40, 329,656.80 and 86,650.40

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Solution

The fourth proportional to 219,814.40, 329,656.80 and 86,650.40 is: 129,950.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,814.40 : 329,656.80 = 86,650.40 : x
  2. Step 2: Convert to fraction form
    219,814.40/329,656.80 = 86,650.40/x
  3. Step 3: Cross multiply
    219,814.40x = 329,656.80 × 86,650.40
  4. Step 4: Simplify right side
    219,814.40x = 28,564,893,582.72
  5. Step 5: Solve for x
    x = 28,564,893,582.72/219,814.40
  6. Step 6: Final answer
    x = 129,950.06

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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.