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Finding the Fourth Proportional to 280,916.36, 421,386.84 and 81,256.92

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Solution

The fourth proportional to 280,916.36, 421,386.84 and 81,256.92 is: 121,888.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,916.36 : 421,386.84 = 81,256.92 : x
  2. Step 2: Convert to fraction form
    280,916.36/421,386.84 = 81,256.92/x
  3. Step 3: Cross multiply
    280,916.36x = 421,386.84 × 81,256.92
  4. Step 4: Simplify right side
    280,916.36x = 34,240,596,340.65
  5. Step 5: Solve for x
    x = 34,240,596,340.65/280,916.36
  6. Step 6: Final answer
    x = 121,888.94

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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.