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Finding the Fourth Proportional to 100,369.79, 138,510.30 and 55,657.79

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Solution

The fourth proportional to 100,369.79, 138,510.30 and 55,657.79 is: 76,807.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,369.79 : 138,510.30 = 55,657.79 : x
  2. Step 2: Convert to fraction form
    100,369.79/138,510.30 = 55,657.79/x
  3. Step 3: Cross multiply
    100,369.79x = 138,510.30 × 55,657.79
  4. Step 4: Simplify right side
    100,369.79x = 7,709,176,497.69
  5. Step 5: Solve for x
    x = 7,709,176,497.69/100,369.79
  6. Step 6: Final answer
    x = 76,807.74

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1.5x scale

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.