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Finding the Fourth Proportional to 78,808.68, 108,756.36 and 42,999.48

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Solution

The fourth proportional to 78,808.68, 108,756.36 and 42,999.48 is: 59,339.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,808.68 : 108,756.36 = 42,999.48 : x
  2. Step 2: Convert to fraction form
    78,808.68/108,756.36 = 42,999.48/x
  3. Step 3: Cross multiply
    78,808.68x = 108,756.36 × 42,999.48
  4. Step 4: Simplify right side
    78,808.68x = 4,676,466,926.69
  5. Step 5: Solve for x
    x = 4,676,466,926.69/78,808.68
  6. Step 6: Final answer
    x = 59,339.49

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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.