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Finding the Fourth Proportional to 99,403.99, 136,988.54 and 71,060.47

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Solution

The fourth proportional to 99,403.99, 136,988.54 and 71,060.47 is: 97,928.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,403.99 : 136,988.54 = 71,060.47 : x
  2. Step 2: Convert to fraction form
    99,403.99/136,988.54 = 71,060.47/x
  3. Step 3: Cross multiply
    99,403.99x = 136,988.54 × 71,060.47
  4. Step 4: Simplify right side
    99,403.99x = 9,734,470,037.01
  5. Step 5: Solve for x
    x = 9,734,470,037.01/99,403.99
  6. Step 6: Final answer
    x = 97,928.36

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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.