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Finding the Fourth Proportional to 78,313.30, 117,506.40 and 40,915.60

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Solution

The fourth proportional to 78,313.30, 117,506.40 and 40,915.60 is: 61,392.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,313.30 : 117,506.40 = 40,915.60 : x
  2. Step 2: Convert to fraction form
    78,313.30/117,506.40 = 40,915.60/x
  3. Step 3: Cross multiply
    78,313.30x = 117,506.40 × 40,915.60
  4. Step 4: Simplify right side
    78,313.30x = 4,807,844,859.84
  5. Step 5: Solve for x
    x = 4,807,844,859.84/78,313.30
  6. Step 6: Final answer
    x = 61,392.44

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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.