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Finding the Fourth Proportional to 639,000.55, 881,820.69 and 352,520.63

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Solution

The fourth proportional to 639,000.55, 881,820.69 and 352,520.63 is: 486,478.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,000.55 : 881,820.69 = 352,520.63 : x
  2. Step 2: Convert to fraction form
    639,000.55/881,820.69 = 352,520.63/x
  3. Step 3: Cross multiply
    639,000.55x = 881,820.69 × 352,520.63
  4. Step 4: Simplify right side
    639,000.55x = 310,859,985,185.84
  5. Step 5: Solve for x
    x = 310,859,985,185.84/639,000.55
  6. Step 6: Final answer
    x = 486,478.43

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Double scale
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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.