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Finding the Fourth Proportional to 205,421.60, 308,132.40 and 139,066.40

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Solution

The fourth proportional to 205,421.60, 308,132.40 and 139,066.40 is: 208,599.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,421.60 : 308,132.40 = 139,066.40 : x
  2. Step 2: Convert to fraction form
    205,421.60/308,132.40 = 139,066.40/x
  3. Step 3: Cross multiply
    205,421.60x = 308,132.40 × 139,066.40
  4. Step 4: Simplify right side
    205,421.60x = 42,850,863,591.36
  5. Step 5: Solve for x
    x = 42,850,863,591.36/205,421.60
  6. Step 6: Final answer
    x = 208,599.60

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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.