Home / 645,742.50-891,132.81-355,387.49

Finding the Fourth Proportional to 645,742.50, 891,132.81 and 355,387.49

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Solution

The fourth proportional to 645,742.50, 891,132.81 and 355,387.49 is: 490,439.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,742.50 : 891,132.81 = 355,387.49 : x
  2. Step 2: Convert to fraction form
    645,742.50/891,132.81 = 355,387.49/x
  3. Step 3: Cross multiply
    645,742.50x = 891,132.81 × 355,387.49
  4. Step 4: Simplify right side
    645,742.50x = 316,697,452,821.33
  5. Step 5: Solve for x
    x = 316,697,452,821.33/645,742.50
  6. Step 6: Final answer
    x = 490,439.23

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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.