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Finding the Fourth Proportional to 421,530.72, 632,296.08 and 172,212.72

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Solution

The fourth proportional to 421,530.72, 632,296.08 and 172,212.72 is: 258,319.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,530.72 : 632,296.08 = 172,212.72 : x
  2. Step 2: Convert to fraction form
    421,530.72/632,296.08 = 172,212.72/x
  3. Step 3: Cross multiply
    421,530.72x = 632,296.08 × 172,212.72
  4. Step 4: Simplify right side
    421,530.72x = 108,889,427,782.14
  5. Step 5: Solve for x
    x = 108,889,427,782.14/421,530.72
  6. Step 6: Final answer
    x = 258,319.08

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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.