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Finding the Fourth Proportional to 103,812.40, 155,718.60 and 70,634.80

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Solution

The fourth proportional to 103,812.40, 155,718.60 and 70,634.80 is: 105,952.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,812.40 : 155,718.60 = 70,634.80 : x
  2. Step 2: Convert to fraction form
    103,812.40/155,718.60 = 70,634.80/x
  3. Step 3: Cross multiply
    103,812.40x = 155,718.60 × 70,634.80
  4. Step 4: Simplify right side
    103,812.40x = 10,999,152,167.28
  5. Step 5: Solve for x
    x = 10,999,152,167.28/103,812.40
  6. Step 6: Final answer
    x = 105,952.20

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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.