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Finding the Fourth Proportional to 99,808.60, 149,712.90 and 40,686.70

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Solution

The fourth proportional to 99,808.60, 149,712.90 and 40,686.70 is: 61,030.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,808.60 : 149,712.90 = 40,686.70 : x
  2. Step 2: Convert to fraction form
    99,808.60/149,712.90 = 40,686.70/x
  3. Step 3: Cross multiply
    99,808.60x = 149,712.90 × 40,686.70
  4. Step 4: Simplify right side
    99,808.60x = 6,091,323,848.43
  5. Step 5: Solve for x
    x = 6,091,323,848.43/99,808.60
  6. Step 6: Final answer
    x = 61,030.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.