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Finding the Fourth Proportional to 205,720.40, 308,580.60 and 72,599.60

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Solution

The fourth proportional to 205,720.40, 308,580.60 and 72,599.60 is: 108,899.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,720.40 : 308,580.60 = 72,599.60 : x
  2. Step 2: Convert to fraction form
    205,720.40/308,580.60 = 72,599.60/x
  3. Step 3: Cross multiply
    205,720.40x = 308,580.60 × 72,599.60
  4. Step 4: Simplify right side
    205,720.40x = 22,402,828,127.76
  5. Step 5: Solve for x
    x = 22,402,828,127.76/205,720.40
  6. Step 6: Final answer
    x = 108,899.40

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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.