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Finding the Fourth Proportional to 78,141.60, 117,212.40 and 25,538.40

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Solution

The fourth proportional to 78,141.60, 117,212.40 and 25,538.40 is: 38,307.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,141.60 : 117,212.40 = 25,538.40 : x
  2. Step 2: Convert to fraction form
    78,141.60/117,212.40 = 25,538.40/x
  3. Step 3: Cross multiply
    78,141.60x = 117,212.40 × 25,538.40
  4. Step 4: Simplify right side
    78,141.60x = 2,993,417,156.16
  5. Step 5: Solve for x
    x = 2,993,417,156.16/78,141.60
  6. Step 6: Final answer
    x = 38,307.60

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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.