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Finding the Fourth Proportional to 138,455.40, 191,069.20 and 78,026.98

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Solution

The fourth proportional to 138,455.40, 191,069.20 and 78,026.98 is: 107,677.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,455.40 : 191,069.20 = 78,026.98 : x
  2. Step 2: Convert to fraction form
    138,455.40/191,069.20 = 78,026.98/x
  3. Step 3: Cross multiply
    138,455.40x = 191,069.20 × 78,026.98
  4. Step 4: Simplify right side
    138,455.40x = 14,908,552,647.02
  5. Step 5: Solve for x
    x = 14,908,552,647.02/138,455.40
  6. Step 6: Final answer
    x = 107,677.65

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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.