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Finding the Fourth Proportional to 219,866.90, 329,701.80 and 86,678.60

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Solution

The fourth proportional to 219,866.90, 329,701.80 and 86,678.60 is: 129,979.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,866.90 : 329,701.80 = 86,678.60 : x
  2. Step 2: Convert to fraction form
    219,866.90/329,701.80 = 86,678.60/x
  3. Step 3: Cross multiply
    219,866.90x = 329,701.80 × 86,678.60
  4. Step 4: Simplify right side
    219,866.90x = 28,578,090,441.48
  5. Step 5: Solve for x
    x = 28,578,090,441.48/219,866.90
  6. Step 6: Final answer
    x = 129,979.05

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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.