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Finding the Fourth Proportional to 139,611.40, 209,417.10 and 86,467.30

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Solution

The fourth proportional to 139,611.40, 209,417.10 and 86,467.30 is: 129,700.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,611.40 : 209,417.10 = 86,467.30 : x
  2. Step 2: Convert to fraction form
    139,611.40/209,417.10 = 86,467.30/x
  3. Step 3: Cross multiply
    139,611.40x = 209,417.10 × 86,467.30
  4. Step 4: Simplify right side
    139,611.40x = 18,107,731,210.83
  5. Step 5: Solve for x
    x = 18,107,731,210.83/139,611.40
  6. Step 6: Final answer
    x = 129,700.95

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1.5x scale

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.