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Finding the Fourth Proportional to 390,772.75, 539,266.40 and 221,003.23

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Solution

The fourth proportional to 390,772.75, 539,266.40 and 221,003.23 is: 304,984.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,772.75 : 539,266.40 = 221,003.23 : x
  2. Step 2: Convert to fraction form
    390,772.75/539,266.40 = 221,003.23/x
  3. Step 3: Cross multiply
    390,772.75x = 539,266.40 × 221,003.23
  4. Step 4: Simplify right side
    390,772.75x = 119,179,616,230.47
  5. Step 5: Solve for x
    x = 119,179,616,230.47/390,772.75
  6. Step 6: Final answer
    x = 304,984.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.