Home / 645,203.62-890,430.87-387,090.28

Finding the Fourth Proportional to 645,203.62, 890,430.87 and 387,090.28

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Solution

The fourth proportional to 645,203.62, 890,430.87 and 387,090.28 is: 534,214.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,203.62 : 890,430.87 = 387,090.28 : x
  2. Step 2: Convert to fraction form
    645,203.62/890,430.87 = 387,090.28/x
  3. Step 3: Cross multiply
    645,203.62x = 890,430.87 × 387,090.28
  4. Step 4: Simplify right side
    645,203.62x = 344,677,134,788.94
  5. Step 5: Solve for x
    x = 344,677,134,788.94/645,203.62
  6. Step 6: Final answer
    x = 534,214.51

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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.