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Finding the Fourth Proportional to 72,871.71, 100,570.13 and 42,655.20

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Solution

The fourth proportional to 72,871.71, 100,570.13 and 42,655.20 is: 58,868.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,871.71 : 100,570.13 = 42,655.20 : x
  2. Step 2: Convert to fraction form
    72,871.71/100,570.13 = 42,655.20/x
  3. Step 3: Cross multiply
    72,871.71x = 100,570.13 × 42,655.20
  4. Step 4: Simplify right side
    72,871.71x = 4,289,839,009.18
  5. Step 5: Solve for x
    x = 4,289,839,009.18/72,871.71
  6. Step 6: Final answer
    x = 58,868.37

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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.