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Finding the Fourth Proportional to 78,125.55, 107,810.15 and 45,855.78

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Solution

The fourth proportional to 78,125.55, 107,810.15 and 45,855.78 is: 63,279.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,125.55 : 107,810.15 = 45,855.78 : x
  2. Step 2: Convert to fraction form
    78,125.55/107,810.15 = 45,855.78/x
  3. Step 3: Cross multiply
    78,125.55x = 107,810.15 × 45,855.78
  4. Step 4: Simplify right side
    78,125.55x = 4,943,718,290.89
  5. Step 5: Solve for x
    x = 4,943,718,290.89/78,125.55
  6. Step 6: Final answer
    x = 63,279.15

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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.