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Finding the Fourth Proportional to 455,999.60, 639,449.20 and 455,999.60

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Solution

The fourth proportional to 455,999.60, 639,449.20 and 455,999.60 is: 639,449.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,999.60 : 639,449.20 = 455,999.60 : x
  2. Step 2: Convert to fraction form
    455,999.60/639,449.20 = 455,999.60/x
  3. Step 3: Cross multiply
    455,999.60x = 639,449.20 × 455,999.60
  4. Step 4: Simplify right side
    455,999.60x = 291,588,579,420.32
  5. Step 5: Solve for x
    x = 291,588,579,420.32/455,999.60
  6. Step 6: Final answer
    x = 639,449.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.