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Finding the Fourth Proportional to 645,911.37, 891,343.71 and 373,991.13

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Solution

The fourth proportional to 645,911.37, 891,343.71 and 373,991.13 is: 516,099.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,911.37 : 891,343.71 = 373,991.13 : x
  2. Step 2: Convert to fraction form
    645,911.37/891,343.71 = 373,991.13/x
  3. Step 3: Cross multiply
    645,911.37x = 891,343.71 × 373,991.13
  4. Step 4: Simplify right side
    645,911.37x = 333,354,641,321.29
  5. Step 5: Solve for x
    x = 333,354,641,321.29/645,911.37
  6. Step 6: Final answer
    x = 516,099.66

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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.