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Finding the Fourth Proportional to 429,999.60, 644,999.40 and 409,332.45

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Solution

The fourth proportional to 429,999.60, 644,999.40 and 409,332.45 is: 613,998.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    429,999.60 : 644,999.40 = 409,332.45 : x
  2. Step 2: Convert to fraction form
    429,999.60/644,999.40 = 409,332.45/x
  3. Step 3: Cross multiply
    429,999.60x = 644,999.40 × 409,332.45
  4. Step 4: Simplify right side
    429,999.60x = 264,019,184,650.53
  5. Step 5: Solve for x
    x = 264,019,184,650.53/429,999.60
  6. Step 6: Final answer
    x = 613,998.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.