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Finding the Fourth Proportional to 87,007.20, 130,510.80 and 76,639.20

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Solution

The fourth proportional to 87,007.20, 130,510.80 and 76,639.20 is: 114,958.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,007.20 : 130,510.80 = 76,639.20 : x
  2. Step 2: Convert to fraction form
    87,007.20/130,510.80 = 76,639.20/x
  3. Step 3: Cross multiply
    87,007.20x = 130,510.80 × 76,639.20
  4. Step 4: Simplify right side
    87,007.20x = 10,002,243,303.36
  5. Step 5: Solve for x
    x = 10,002,243,303.36/87,007.20
  6. Step 6: Final answer
    x = 114,958.80

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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.