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Finding the Fourth Proportional to 455,999.40, 639,973.80 and 455,999.40

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Solution

The fourth proportional to 455,999.40, 639,973.80 and 455,999.40 is: 639,973.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,999.40 : 639,973.80 = 455,999.40 : x
  2. Step 2: Convert to fraction form
    455,999.40/639,973.80 = 455,999.40/x
  3. Step 3: Cross multiply
    455,999.40x = 639,973.80 × 455,999.40
  4. Step 4: Simplify right side
    455,999.40x = 291,827,668,815.72
  5. Step 5: Solve for x
    x = 291,827,668,815.72/455,999.40
  6. Step 6: Final answer
    x = 639,973.80

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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.