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Finding the Fourth Proportional to 78,423.60, 117,635.40 and 72,663.60

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Solution

The fourth proportional to 78,423.60, 117,635.40 and 72,663.60 is: 108,995.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,423.60 : 117,635.40 = 72,663.60 : x
  2. Step 2: Convert to fraction form
    78,423.60/117,635.40 = 72,663.60/x
  3. Step 3: Cross multiply
    78,423.60x = 117,635.40 × 72,663.60
  4. Step 4: Simplify right side
    78,423.60x = 8,547,811,651.44
  5. Step 5: Solve for x
    x = 8,547,811,651.44/78,423.60
  6. Step 6: Final answer
    x = 108,995.40

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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.