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Finding the Fourth Proportional to 280,690.34, 387,348.12 and 153,363.20

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Solution

The fourth proportional to 280,690.34, 387,348.12 and 153,363.20 is: 211,638.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,690.34 : 387,348.12 = 153,363.20 : x
  2. Step 2: Convert to fraction form
    280,690.34/387,348.12 = 153,363.20/x
  3. Step 3: Cross multiply
    280,690.34x = 387,348.12 × 153,363.20
  4. Step 4: Simplify right side
    280,690.34x = 59,404,945,260.44
  5. Step 5: Solve for x
    x = 59,404,945,260.44/280,690.34
  6. Step 6: Final answer
    x = 211,638.73

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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.