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Finding the Fourth Proportional to 280,355.70, 386,890.76 and 153,031.29

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Solution

The fourth proportional to 280,355.70, 386,890.76 and 153,031.29 is: 211,183.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,355.70 : 386,890.76 = 153,031.29 : x
  2. Step 2: Convert to fraction form
    280,355.70/386,890.76 = 153,031.29/x
  3. Step 3: Cross multiply
    280,355.70x = 386,890.76 × 153,031.29
  4. Step 4: Simplify right side
    280,355.70x = 59,206,393,199.88
  5. Step 5: Solve for x
    x = 59,206,393,199.88/280,355.70
  6. Step 6: Final answer
    x = 211,183.13

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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.