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Finding the Fourth Proportional to 78,842.20, 118,263.30 and 64,845.40

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Solution

The fourth proportional to 78,842.20, 118,263.30 and 64,845.40 is: 97,268.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,842.20 : 118,263.30 = 64,845.40 : x
  2. Step 2: Convert to fraction form
    78,842.20/118,263.30 = 64,845.40/x
  3. Step 3: Cross multiply
    78,842.20x = 118,263.30 × 64,845.40
  4. Step 4: Simplify right side
    78,842.20x = 7,668,830,993.82
  5. Step 5: Solve for x
    x = 7,668,830,993.82/78,842.20
  6. Step 6: Final answer
    x = 97,268.10

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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.