Home / 645,193.81-890,417.33-387,080.42

Finding the Fourth Proportional to 645,193.81, 890,417.33 and 387,080.42

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Solution

The fourth proportional to 645,193.81, 890,417.33 and 387,080.42 is: 534,200.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,193.81 : 890,417.33 = 387,080.42 : x
  2. Step 2: Convert to fraction form
    645,193.81/890,417.33 = 387,080.42/x
  3. Step 3: Cross multiply
    645,193.81x = 890,417.33 × 387,080.42
  4. Step 4: Simplify right side
    645,193.81x = 344,663,115,813.87
  5. Step 5: Solve for x
    x = 344,663,115,813.87/645,193.81
  6. Step 6: Final answer
    x = 534,200.90

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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.