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Finding the Fourth Proportional to 78,699.20, 108,606.08 and 42,890.88

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Solution

The fourth proportional to 78,699.20, 108,606.08 and 42,890.88 is: 59,190.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,699.20 : 108,606.08 = 42,890.88 : x
  2. Step 2: Convert to fraction form
    78,699.20/108,606.08 = 42,890.88/x
  3. Step 3: Cross multiply
    78,699.20x = 108,606.08 × 42,890.88
  4. Step 4: Simplify right side
    78,699.20x = 4,658,210,344.55
  5. Step 5: Solve for x
    x = 4,658,210,344.55/78,699.20
  6. Step 6: Final answer
    x = 59,190.06

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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.