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Finding the Fourth Proportional to 189,681.99, 261,758.05 and 103,639.08

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Solution

The fourth proportional to 189,681.99, 261,758.05 and 103,639.08 is: 143,020.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,681.99 : 261,758.05 = 103,639.08 : x
  2. Step 2: Convert to fraction form
    189,681.99/261,758.05 = 103,639.08/x
  3. Step 3: Cross multiply
    189,681.99x = 261,758.05 × 103,639.08
  4. Step 4: Simplify right side
    189,681.99x = 27,128,363,484.59
  5. Step 5: Solve for x
    x = 27,128,363,484.59/189,681.99
  6. Step 6: Final answer
    x = 143,020.24

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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.