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Finding the Fourth Proportional to 78,642.60, 117,980.28 and 26,056.20

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Solution

The fourth proportional to 78,642.60, 117,980.28 and 26,056.20 is: 39,089.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,642.60 : 117,980.28 = 26,056.20 : x
  2. Step 2: Convert to fraction form
    78,642.60/117,980.28 = 26,056.20/x
  3. Step 3: Cross multiply
    78,642.60x = 117,980.28 × 26,056.20
  4. Step 4: Simplify right side
    78,642.60x = 3,074,117,771.74
  5. Step 5: Solve for x
    x = 3,074,117,771.74/78,642.60
  6. Step 6: Final answer
    x = 39,089.73

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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.