Home / 280,913.21-421,409.79-91,312.62

Finding the Fourth Proportional to 280,913.21, 421,409.79 and 91,312.62

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Solution

The fourth proportional to 280,913.21, 421,409.79 and 91,312.62 is: 136,981.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,913.21 : 421,409.79 = 91,312.62 : x
  2. Step 2: Convert to fraction form
    280,913.21/421,409.79 = 91,312.62/x
  3. Step 3: Cross multiply
    280,913.21x = 421,409.79 × 91,312.62
  4. Step 4: Simplify right side
    280,913.21x = 38,480,032,018.55
  5. Step 5: Solve for x
    x = 38,480,032,018.55/280,913.21
  6. Step 6: Final answer
    x = 136,981.93

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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.