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Finding the Fourth Proportional to 86,465.66, 128,838.96 and 77,033.21

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Solution

The fourth proportional to 86,465.66, 128,838.96 and 77,033.21 is: 114,784.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,465.66 : 128,838.96 = 77,033.21 : x
  2. Step 2: Convert to fraction form
    86,465.66/128,838.96 = 77,033.21/x
  3. Step 3: Cross multiply
    86,465.66x = 128,838.96 × 77,033.21
  4. Step 4: Simplify right side
    86,465.66x = 9,924,878,017.67
  5. Step 5: Solve for x
    x = 9,924,878,017.67/86,465.66
  6. Step 6: Final answer
    x = 114,784.05

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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.