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Finding the Fourth Proportional to 83,590.80, 125,386.20 and 77,110.80

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Solution

The fourth proportional to 83,590.80, 125,386.20 and 77,110.80 is: 115,666.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,590.80 : 125,386.20 = 77,110.80 : x
  2. Step 2: Convert to fraction form
    83,590.80/125,386.20 = 77,110.80/x
  3. Step 3: Cross multiply
    83,590.80x = 125,386.20 × 77,110.80
  4. Step 4: Simplify right side
    83,590.80x = 9,668,630,190.96
  5. Step 5: Solve for x
    x = 9,668,630,190.96/83,590.80
  6. Step 6: Final answer
    x = 115,666.20

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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.