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Finding the Fourth Proportional to 78,649.65, 108,490.55 and 55,653.63

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Solution

The fourth proportional to 78,649.65, 108,490.55 and 55,653.63 is: 76,769.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,649.65 : 108,490.55 = 55,653.63 : x
  2. Step 2: Convert to fraction form
    78,649.65/108,490.55 = 55,653.63/x
  3. Step 3: Cross multiply
    78,649.65x = 108,490.55 × 55,653.63
  4. Step 4: Simplify right side
    78,649.65x = 6,037,892,649.93
  5. Step 5: Solve for x
    x = 6,037,892,649.93/78,649.65
  6. Step 6: Final answer
    x = 76,769.48

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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.