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Finding the Fourth Proportional to 138,647.51, 191,333.57 and 74,985.29

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Solution

The fourth proportional to 138,647.51, 191,333.57 and 74,985.29 is: 103,479.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,647.51 : 191,333.57 = 74,985.29 : x
  2. Step 2: Convert to fraction form
    138,647.51/191,333.57 = 74,985.29/x
  3. Step 3: Cross multiply
    138,647.51x = 191,333.57 × 74,985.29
  4. Step 4: Simplify right side
    138,647.51x = 14,347,201,901.59
  5. Step 5: Solve for x
    x = 14,347,201,901.59/138,647.51
  6. Step 6: Final answer
    x = 103,479.70

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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.