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Finding the Fourth Proportional to 78,666.28, 108,558.90 and 42,856.28

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Solution

The fourth proportional to 78,666.28, 108,558.90 and 42,856.28 is: 59,141.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,666.28 : 108,558.90 = 42,856.28 : x
  2. Step 2: Convert to fraction form
    78,666.28/108,558.90 = 42,856.28/x
  3. Step 3: Cross multiply
    78,666.28x = 108,558.90 × 42,856.28
  4. Step 4: Simplify right side
    78,666.28x = 4,652,430,614.89
  5. Step 5: Solve for x
    x = 4,652,430,614.89/78,666.28
  6. Step 6: Final answer
    x = 59,141.36

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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.