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Finding the Fourth Proportional to 121,323.40, 181,985.10 and 77,000.20

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Solution

The fourth proportional to 121,323.40, 181,985.10 and 77,000.20 is: 115,500.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,323.40 : 181,985.10 = 77,000.20 : x
  2. Step 2: Convert to fraction form
    121,323.40/181,985.10 = 77,000.20/x
  3. Step 3: Cross multiply
    121,323.40x = 181,985.10 × 77,000.20
  4. Step 4: Simplify right side
    121,323.40x = 14,012,889,097.02
  5. Step 5: Solve for x
    x = 14,012,889,097.02/121,323.40
  6. Step 6: Final answer
    x = 115,500.30

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Similar ratio
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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.