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Finding the Fourth Proportional to 78,700.28, 108,606.51 and 42,890.27

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Solution

The fourth proportional to 78,700.28, 108,606.51 and 42,890.27 is: 59,188.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,700.28 : 108,606.51 = 42,890.27 : x
  2. Step 2: Convert to fraction form
    78,700.28/108,606.51 = 42,890.27/x
  3. Step 3: Cross multiply
    78,700.28x = 108,606.51 × 42,890.27
  4. Step 4: Simplify right side
    78,700.28x = 4,658,161,994.63
  5. Step 5: Solve for x
    x = 4,658,161,994.63/78,700.28
  6. Step 6: Final answer
    x = 59,188.64

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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.