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Finding the Fourth Proportional to 646,135.20, 891,660 and 355,737.60

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Solution

The fourth proportional to 646,135.20, 891,660 and 355,737.60 is: 490,914.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    646,135.20 : 891,660 = 355,737.60 : x
  2. Step 2: Convert to fraction form
    646,135.20/891,660 = 355,737.60/x
  3. Step 3: Cross multiply
    646,135.20x = 891,660 × 355,737.60
  4. Step 4: Simplify right side
    646,135.20x = 317,196,988,416
  5. Step 5: Solve for x
    x = 317,196,988,416/646,135.20
  6. Step 6: Final answer
    x = 490,914.27

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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.