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Finding the Fourth Proportional to 99,712.68, 137,603.63 and 57,279.42

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Solution

The fourth proportional to 99,712.68, 137,603.63 and 57,279.42 is: 79,045.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,712.68 : 137,603.63 = 57,279.42 : x
  2. Step 2: Convert to fraction form
    99,712.68/137,603.63 = 57,279.42/x
  3. Step 3: Cross multiply
    99,712.68x = 137,603.63 × 57,279.42
  4. Step 4: Simplify right side
    99,712.68x = 7,881,855,829.90
  5. Step 5: Solve for x
    x = 7,881,855,829.90/99,712.68
  6. Step 6: Final answer
    x = 79,045.67

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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.