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Finding the Fourth Proportional to 78,605.40, 117,908.10 and 39,239.40

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Solution

The fourth proportional to 78,605.40, 117,908.10 and 39,239.40 is: 58,859.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,605.40 : 117,908.10 = 39,239.40 : x
  2. Step 2: Convert to fraction form
    78,605.40/117,908.10 = 39,239.40/x
  3. Step 3: Cross multiply
    78,605.40x = 117,908.10 × 39,239.40
  4. Step 4: Simplify right side
    78,605.40x = 4,626,643,099.14
  5. Step 5: Solve for x
    x = 4,626,643,099.14/78,605.40
  6. Step 6: Final answer
    x = 58,859.10

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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.