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Finding the Fourth Proportional to 138,470.70, 191,089.74 and 74,808.50

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Solution

The fourth proportional to 138,470.70, 191,089.74 and 74,808.50 is: 103,235.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,470.70 : 191,089.74 = 74,808.50 : x
  2. Step 2: Convert to fraction form
    138,470.70/191,089.74 = 74,808.50/x
  3. Step 3: Cross multiply
    138,470.70x = 191,089.74 × 74,808.50
  4. Step 4: Simplify right side
    138,470.70x = 14,295,136,814.79
  5. Step 5: Solve for x
    x = 14,295,136,814.79/138,470.70
  6. Step 6: Final answer
    x = 103,235.82

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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.