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Finding the Fourth Proportional to 78,307.20, 117,331.20 and 66,643.20

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Solution

The fourth proportional to 78,307.20, 117,331.20 and 66,643.20 is: 99,854.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,307.20 : 117,331.20 = 66,643.20 : x
  2. Step 2: Convert to fraction form
    78,307.20/117,331.20 = 66,643.20/x
  3. Step 3: Cross multiply
    78,307.20x = 117,331.20 × 66,643.20
  4. Step 4: Simplify right side
    78,307.20x = 7,819,326,627.84
  5. Step 5: Solve for x
    x = 7,819,326,627.84/78,307.20
  6. Step 6: Final answer
    x = 99,854.50

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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.