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Finding the Fourth Proportional to 458,530.40, 687,212.40 and 221,362.40

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Solution

The fourth proportional to 458,530.40, 687,212.40 and 221,362.40 is: 331,762.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,530.40 : 687,212.40 = 221,362.40 : x
  2. Step 2: Convert to fraction form
    458,530.40/687,212.40 = 221,362.40/x
  3. Step 3: Cross multiply
    458,530.40x = 687,212.40 × 221,362.40
  4. Step 4: Simplify right side
    458,530.40x = 152,122,986,173.76
  5. Step 5: Solve for x
    x = 152,122,986,173.76/458,530.40
  6. Step 6: Final answer
    x = 331,762.05

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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.