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Finding the Fourth Proportional to 138,602.45, 191,271.66 and 74,940.25

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Solution

The fourth proportional to 138,602.45, 191,271.66 and 74,940.25 is: 103,417.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,602.45 : 191,271.66 = 74,940.25 : x
  2. Step 2: Convert to fraction form
    138,602.45/191,271.66 = 74,940.25/x
  3. Step 3: Cross multiply
    138,602.45x = 191,271.66 × 74,940.25
  4. Step 4: Simplify right side
    138,602.45x = 14,333,946,018.32
  5. Step 5: Solve for x
    x = 14,333,946,018.32/138,602.45
  6. Step 6: Final answer
    x = 103,417.70

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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.