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Finding the Fourth Proportional to 85,415.70, 128,123.55 and 77,121.30

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Solution

The fourth proportional to 85,415.70, 128,123.55 and 77,121.30 is: 115,681.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,415.70 : 128,123.55 = 77,121.30 : x
  2. Step 2: Convert to fraction form
    85,415.70/128,123.55 = 77,121.30/x
  3. Step 3: Cross multiply
    85,415.70x = 128,123.55 × 77,121.30
  4. Step 4: Simplify right side
    85,415.70x = 9,881,054,736.62
  5. Step 5: Solve for x
    x = 9,881,054,736.62/85,415.70
  6. Step 6: Final answer
    x = 115,681.95

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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.