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Finding the Fourth Proportional to 86,503.95, 128,896.02 and 77,071.50

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Solution

The fourth proportional to 86,503.95, 128,896.02 and 77,071.50 is: 114,841.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,503.95 : 128,896.02 = 77,071.50 : x
  2. Step 2: Convert to fraction form
    86,503.95/128,896.02 = 77,071.50/x
  3. Step 3: Cross multiply
    86,503.95x = 128,896.02 × 77,071.50
  4. Step 4: Simplify right side
    86,503.95x = 9,934,209,605.43
  5. Step 5: Solve for x
    x = 9,934,209,605.43/86,503.95
  6. Step 6: Final answer
    x = 114,841.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.