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Finding the Fourth Proportional to 86,479.96, 128,860.21 and 77,047.50

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Solution

The fourth proportional to 86,479.96, 128,860.21 and 77,047.50 is: 114,805.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,479.96 : 128,860.21 = 77,047.50 : x
  2. Step 2: Convert to fraction form
    86,479.96/128,860.21 = 77,047.50/x
  3. Step 3: Cross multiply
    86,479.96x = 128,860.21 × 77,047.50
  4. Step 4: Simplify right side
    86,479.96x = 9,928,357,029.98
  5. Step 5: Solve for x
    x = 9,928,357,029.98/86,479.96
  6. Step 6: Final answer
    x = 114,805.29

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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.