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Finding the Fourth Proportional to 309,690.77, 427,285.39 and 180,634.87

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Solution

The fourth proportional to 309,690.77, 427,285.39 and 180,634.87 is: 249,224.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,690.77 : 427,285.39 = 180,634.87 : x
  2. Step 2: Convert to fraction form
    309,690.77/427,285.39 = 180,634.87/x
  3. Step 3: Cross multiply
    309,690.77x = 427,285.39 × 180,634.87
  4. Step 4: Simplify right side
    309,690.77x = 77,182,640,875.55
  5. Step 5: Solve for x
    x = 77,182,640,875.55/309,690.77
  6. Step 6: Final answer
    x = 249,224.87

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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.