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Finding the Fourth Proportional to 78,482.40, 117,621.20 and 36,357.60

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Solution

The fourth proportional to 78,482.40, 117,621.20 and 36,357.60 is: 54,488.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,482.40 : 117,621.20 = 36,357.60 : x
  2. Step 2: Convert to fraction form
    78,482.40/117,621.20 = 36,357.60/x
  3. Step 3: Cross multiply
    78,482.40x = 117,621.20 × 36,357.60
  4. Step 4: Simplify right side
    78,482.40x = 4,276,424,541.12
  5. Step 5: Solve for x
    x = 4,276,424,541.12/78,482.40
  6. Step 6: Final answer
    x = 54,488.96

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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.