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Finding the Fourth Proportional to 389,968.90, 585,038.40 and 221,569.90

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Solution

The fourth proportional to 389,968.90, 585,038.40 and 221,569.90 is: 332,403.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,968.90 : 585,038.40 = 221,569.90 : x
  2. Step 2: Convert to fraction form
    389,968.90/585,038.40 = 221,569.90/x
  3. Step 3: Cross multiply
    389,968.90x = 585,038.40 × 221,569.90
  4. Step 4: Simplify right side
    389,968.90x = 129,626,899,784.16
  5. Step 5: Solve for x
    x = 129,626,899,784.16/389,968.90
  6. Step 6: Final answer
    x = 332,403.17

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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.