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Finding the Fourth Proportional to 103,813.40, 155,720.10 and 70,635.80

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Solution

The fourth proportional to 103,813.40, 155,720.10 and 70,635.80 is: 105,953.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,813.40 : 155,720.10 = 70,635.80 : x
  2. Step 2: Convert to fraction form
    103,813.40/155,720.10 = 70,635.80/x
  3. Step 3: Cross multiply
    103,813.40x = 155,720.10 × 70,635.80
  4. Step 4: Simplify right side
    103,813.40x = 10,999,413,839.58
  5. Step 5: Solve for x
    x = 10,999,413,839.58/103,813.40
  6. Step 6: Final answer
    x = 105,953.70

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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.