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Finding the Fourth Proportional to 139,855.28, 209,848.53 and 69,740.06

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Solution

The fourth proportional to 139,855.28, 209,848.53 and 69,740.06 is: 104,642.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,855.28 : 209,848.53 = 69,740.06 : x
  2. Step 2: Convert to fraction form
    139,855.28/209,848.53 = 69,740.06/x
  3. Step 3: Cross multiply
    139,855.28x = 209,848.53 × 69,740.06
  4. Step 4: Simplify right side
    139,855.28x = 14,634,849,073.11
  5. Step 5: Solve for x
    x = 14,634,849,073.11/139,855.28
  6. Step 6: Final answer
    x = 104,642.81

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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.