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Finding the Fourth Proportional to 86,685.70, 130,028.55 and 76,663.30

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Solution

The fourth proportional to 86,685.70, 130,028.55 and 76,663.30 is: 114,994.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,685.70 : 130,028.55 = 76,663.30 : x
  2. Step 2: Convert to fraction form
    86,685.70/130,028.55 = 76,663.30/x
  3. Step 3: Cross multiply
    86,685.70x = 130,028.55 × 76,663.30
  4. Step 4: Simplify right side
    86,685.70x = 9,968,417,737.22
  5. Step 5: Solve for x
    x = 9,968,417,737.22/86,685.70
  6. Step 6: Final answer
    x = 114,994.95

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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.