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Finding the Fourth Proportional to 76,807.40, 115,211.10 and 21,403.40

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Solution

The fourth proportional to 76,807.40, 115,211.10 and 21,403.40 is: 32,105.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,807.40 : 115,211.10 = 21,403.40 : x
  2. Step 2: Convert to fraction form
    76,807.40/115,211.10 = 21,403.40/x
  3. Step 3: Cross multiply
    76,807.40x = 115,211.10 × 21,403.40
  4. Step 4: Simplify right side
    76,807.40x = 2,465,909,257.74
  5. Step 5: Solve for x
    x = 2,465,909,257.74/76,807.40
  6. Step 6: Final answer
    x = 32,105.10

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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.