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Finding the Fourth Proportional to 70,980.32, 106,486.20 and 21,064.40

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Solution

The fourth proportional to 70,980.32, 106,486.20 and 21,064.40 is: 31,601.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,980.32 : 106,486.20 = 21,064.40 : x
  2. Step 2: Convert to fraction form
    70,980.32/106,486.20 = 21,064.40/x
  3. Step 3: Cross multiply
    70,980.32x = 106,486.20 × 21,064.40
  4. Step 4: Simplify right side
    70,980.32x = 2,243,067,911.28
  5. Step 5: Solve for x
    x = 2,243,067,911.28/70,980.32
  6. Step 6: Final answer
    x = 31,601.27

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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.