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Finding the Fourth Proportional to 139,898.34, 209,888.48 and 45,126.72

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Solution

The fourth proportional to 139,898.34, 209,888.48 and 45,126.72 is: 67,703.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,898.34 : 209,888.48 = 45,126.72 : x
  2. Step 2: Convert to fraction form
    139,898.34/209,888.48 = 45,126.72/x
  3. Step 3: Cross multiply
    139,898.34x = 209,888.48 × 45,126.72
  4. Step 4: Simplify right side
    139,898.34x = 9,471,578,781.00
  5. Step 5: Solve for x
    x = 9,471,578,781.00/139,898.34
  6. Step 6: Final answer
    x = 67,703.30

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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.