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Finding the Fourth Proportional to 138,492.19, 191,119.35 and 74,830.15

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Solution

The fourth proportional to 138,492.19, 191,119.35 and 74,830.15 is: 103,265.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,492.19 : 191,119.35 = 74,830.15 : x
  2. Step 2: Convert to fraction form
    138,492.19/191,119.35 = 74,830.15/x
  3. Step 3: Cross multiply
    138,492.19x = 191,119.35 × 74,830.15
  4. Step 4: Simplify right side
    138,492.19x = 14,301,489,628.40
  5. Step 5: Solve for x
    x = 14,301,489,628.40/138,492.19
  6. Step 6: Final answer
    x = 103,265.68

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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.