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Finding the Fourth Proportional to 91,859.10, 137,788.65 and 52,420.20

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Solution

The fourth proportional to 91,859.10, 137,788.65 and 52,420.20 is: 78,630.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,859.10 : 137,788.65 = 52,420.20 : x
  2. Step 2: Convert to fraction form
    91,859.10/137,788.65 = 52,420.20/x
  3. Step 3: Cross multiply
    91,859.10x = 137,788.65 × 52,420.20
  4. Step 4: Simplify right side
    91,859.10x = 7,222,908,590.73
  5. Step 5: Solve for x
    x = 7,222,908,590.73/91,859.10
  6. Step 6: Final answer
    x = 78,630.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.