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Finding the Fourth Proportional to 260,039.80, 390,059.70 and 215,716.60

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Solution

The fourth proportional to 260,039.80, 390,059.70 and 215,716.60 is: 323,574.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,039.80 : 390,059.70 = 215,716.60 : x
  2. Step 2: Convert to fraction form
    260,039.80/390,059.70 = 215,716.60/x
  3. Step 3: Cross multiply
    260,039.80x = 390,059.70 × 215,716.60
  4. Step 4: Simplify right side
    260,039.80x = 84,142,352,281.02
  5. Step 5: Solve for x
    x = 84,142,352,281.02/260,039.80
  6. Step 6: Final answer
    x = 323,574.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.