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Finding the Fourth Proportional to 353,153.91, 530,063.79 and 128,731.26

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Solution

The fourth proportional to 353,153.91, 530,063.79 and 128,731.26 is: 193,218.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    353,153.91 : 530,063.79 = 128,731.26 : x
  2. Step 2: Convert to fraction form
    353,153.91/530,063.79 = 128,731.26/x
  3. Step 3: Cross multiply
    353,153.91x = 530,063.79 × 128,731.26
  4. Step 4: Simplify right side
    353,153.91x = 68,235,779,567.08
  5. Step 5: Solve for x
    x = 68,235,779,567.08/353,153.91
  6. Step 6: Final answer
    x = 193,218.25

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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.