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Finding the Fourth Proportional to 74,619.79, 103,039.31 and 72,206.90

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Solution

The fourth proportional to 74,619.79, 103,039.31 and 72,206.90 is: 99,707.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,619.79 : 103,039.31 = 72,206.90 : x
  2. Step 2: Convert to fraction form
    74,619.79/103,039.31 = 72,206.90/x
  3. Step 3: Cross multiply
    74,619.79x = 103,039.31 × 72,206.90
  4. Step 4: Simplify right side
    74,619.79x = 7,440,149,153.24
  5. Step 5: Solve for x
    x = 7,440,149,153.24/74,619.79
  6. Step 6: Final answer
    x = 99,707.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.