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Finding the Fourth Proportional to 78,655.20, 117,962.16 and 53,690.64

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Solution

The fourth proportional to 78,655.20, 117,962.16 and 53,690.64 is: 80,521.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,655.20 : 117,962.16 = 53,690.64 : x
  2. Step 2: Convert to fraction form
    78,655.20/117,962.16 = 53,690.64/x
  3. Step 3: Cross multiply
    78,655.20x = 117,962.16 × 53,690.64
  4. Step 4: Simplify right side
    78,655.20x = 6,333,463,866.18
  5. Step 5: Solve for x
    x = 6,333,463,866.18/78,655.20
  6. Step 6: Final answer
    x = 80,521.87

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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.