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Finding the Fourth Proportional to 353,213.58, 488,718.28 and 307,985.80

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Solution

The fourth proportional to 353,213.58, 488,718.28 and 307,985.80 is: 426,139.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    353,213.58 : 488,718.28 = 307,985.80 : x
  2. Step 2: Convert to fraction form
    353,213.58/488,718.28 = 307,985.80/x
  3. Step 3: Cross multiply
    353,213.58x = 488,718.28 × 307,985.80
  4. Step 4: Simplify right side
    353,213.58x = 150,518,290,440.42
  5. Step 5: Solve for x
    x = 150,518,290,440.42/353,213.58
  6. Step 6: Final answer
    x = 426,139.59

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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.