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Finding the Fourth Proportional to 70,159.40, 105,239.10 and 20,911.40

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Solution

The fourth proportional to 70,159.40, 105,239.10 and 20,911.40 is: 31,367.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,159.40 : 105,239.10 = 20,911.40 : x
  2. Step 2: Convert to fraction form
    70,159.40/105,239.10 = 20,911.40/x
  3. Step 3: Cross multiply
    70,159.40x = 105,239.10 × 20,911.40
  4. Step 4: Simplify right side
    70,159.40x = 2,200,696,915.74
  5. Step 5: Solve for x
    x = 2,200,696,915.74/70,159.40
  6. Step 6: Final answer
    x = 31,367.10

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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.