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Finding the Fourth Proportional to 439,973.79, 607,172.42 and 287,109.78

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Solution

The fourth proportional to 439,973.79, 607,172.42 and 287,109.78 is: 396,217.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    439,973.79 : 607,172.42 = 287,109.78 : x
  2. Step 2: Convert to fraction form
    439,973.79/607,172.42 = 287,109.78/x
  3. Step 3: Cross multiply
    439,973.79x = 607,172.42 × 287,109.78
  4. Step 4: Simplify right side
    439,973.79x = 174,325,138,492.72
  5. Step 5: Solve for x
    x = 174,325,138,492.72/439,973.79
  6. Step 6: Final answer
    x = 396,217.10

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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.